US1002379A - Crushing-mill. - Google Patents

Description

Witwe/ao A Y -11.13. EMORY.' GRUSHING MILL.

APPLIGATION FILED FEBJI, 1910.

1,002,379. Patented sep1.5,1911.

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ARTHUR B. EMORY, OF CANON CITY, COLORADO.

CRUSI-IING-MILL.

Specification of Letters Patent.

Patented Sept. 5, 1911.

Application led February 11, 1910. Serial No. 543,250.

To all whom it may concern.

Be it known that I, ARTHUR B. EMORY, a citizen of the United States, residing at Canon City, in the county of Fremont and State of Colorado, have invented a new and useful Crushing-Mill, of which the following is a specification.

This invention is a mill designed primarily for reducing and crushing ores, and it has for its object to provide a simple and highly eflicient mill of this kind adapted for placer mining, as well as for all free milling ores, and which will operate without loss of any of the values.

lVit-h the herein stated objects in view, the invention consists in a novel construction and arrangement of the parts to be hreinafter described and claimed, and in order that the invention may be fully understood, reference is had to the accompanying drawing forming a part of this specification, in which, v

Figure 1 is a central longitudinal section of the mill, and Fig. 2 is a cross section on the line 2-2 of Fig. 1.

Referring more particularly to the drawing, 5 denotes a suitable framework on which the mill is mounted. In a boX 6 supported on this framework, are located two pairs of crushing rollers 7 and 8, respectively, the shafts of said rollers being supported in bearings 9. These bearings are adjustable as usual in crushing mills so that the rollers may be set apart the required distance. Beneath the bottom pair of rollers-is mounted a rotary table 10 on which the material as it issues from between the rollers drops. This table is circular, and has at the bottom a pivot stud l1 mounted in a step bearing 12 formed at the outer end of spider arms 13 extending from the frame 5 of the mill below the table.

The table 10 is rotated by means of a pinion 14 on a shaft 15, said pinion meshing with an annular rack 16 formed on the bottom of the table. The shaft 15 is provided with a drive pulley 17, and is mounted in suitable bearings 18 carried by the frame 5. One of the spider arms 13 also has a longitudinal bore 19 through which the shaft eX- tends.

Below the table is located a circular track 20 provided with anti-friction rollers 2l engageable with the bottom of the table, near the edge thereof, to preventthe table from being tilted by the weight of the material thereon, when the mill is in operation.

The shaft 15 extends parallel with the rollers 7 and 8 and is employed for driving the same also, the following gearing being provided for this purpose: On the shaft are fastened spur gears 22 in mesh with pinions 23 fastened on the ends of the shaft 24 of one of the bottom rollers 8. On the ends of the shaft 25 of the other bottom roller, are fast sprocket wheels 26 which are connected by chains 27 to sprocket wheels 28 on the shaft 15. The top rollers 7 are driven from the bottom rollers, the shaft of said bottom rollers being provided with sprocket wheels 29 which are connected by chains 30 to sprocket wheels 31 on the shafts of the top rollers.

Beneath the table 10 is mounted a receptacle 32 having a hopper bottom 33. This receptacle is designed to hold a supply of mercury or some other amalgamating agent as indicated at 34, said agent being placed in the hopper bottom, and above the level of the amalgamating agent, the hopper has an outlet opening 35. The receptacle 32 is supported on the frame 5 by suitable catches 36 in such a way that it may be removed.

At 37 is indicated a hose by which water is conducted to the table 10 for the purpose of washing the crushed material off the same into the receptacle 32.

In the upper portion of the box 6 is located a feed hopper 38 arranged to discharge the material to be crushed between the top rollers 7.

In operation, the material to be crushed is thrown into the hopper 38, and is fed thereby between the top rollers 7. Inasmuch as two sets of crushing rollers are provided, the material is crushed twice, after which it drops on the rotating table 10. It is prevented from adhering to the table by directing a stream of water thereonto from the hose 37. The crushed material is thus washed. into the receptacle 32, in which amalgamation takes place. The water escapes through the outlet opening 35. If desired the material can be run into vats, and the cyanid process employed.

The mill is adapted for placer mining, as well as for free milling ore. It saves all the free gold, and polishes the rough gold,

40 tating more rapidly than those portions Y and crushes all the quartz containing gold [which is usually lostV in the sluice box. A .very small quantity of water is required to operate the mill, which adapts it more especially for localities having a limited water supply. The mill can also be used for crushing brick and other material, and as many or asfew sets of rollers as are necessary for the required work may be provided. By using one set of rollers, vthe mill can also be used for crushing feed.

The revolving table 10 pulverizes the material still finer as it drops thereon from the rollers, and polishes the rusty gold, and

scatters the pulverizedsubstance over the surface of theamalgamating agent.

I consider the provision of a table rotating in a horizontal plane, beneath Vand inv 'rolls where it is given the second crushing,

and thence it falls upon the table. VThat portion of theimaterial which falls at the center of the table turns around and around until it is dissipated, but that portion which falls between the ends of the lower pair of rolls reaches the table where the latter is revolving in either one direction or the other and by the table is carried out from under the adjacent roller. No part of the latter from the center to its extremity is revolving Vin the same ratio with respect to the surface of the table as any other part, that portion of the table near its periphery of course ronear its center. It follows, therefore, that the material, even after having been given its second crushing between the lowermcst pair of rolls, is given a third crushing by a grinding action between the lower sides of the lower rolls and a section of the table, and this would not be the case if the rolls were conical as is sometimes employed in this type of machine.

What is claimed is 1. In a crushing mill, the combination with a fiat circular table rot-ating on a vertical axis, of a pair of cylindrical rolls disposed across and above said table with their axes lying in parallel chords of said table equi-distant from a true diameter through said table and their upper sides rotating toward each other at the saine speed, and means for delivering the material to a point between said rolls.

2. In a crushing mill, the combination with a flat circular table rotating on a vertical axis, of a pair of cylindrical rolls disposed across and above said table with their axes lying in parallel chords of said table and their upper sides rotating toward each other at the same speed, a second pair of rolls above the first pair and rotating toward each other, and means for feeding material between the uppermost pair.

3. In a crushing mill, the combination with a spider having a step bearing, a horizontal circular table having a stud journaled in said bearing, an annular rack on the lower face of the table, a shaft extending through the spider beneath said bearing, a pinion fast on the shaft meshing with said rack, and means for rotating continuously in one direction; of a pair of cylindrical rolls disposed across and above the surface of said table with their axes lying in parallel chords of said table, a gear pinion on the shaft of one roll and a sprocket wheel on the shaft of the other, a spur gear on the driving shaft connected with said gear pinion, and a sprocket wheel also on said driving shaft connected with said other sprocket wheel. r

In testimony that I claim the foregoing as my own, I have hereto aifixed my signature in the presence of two witnesses.

ARTHUR B. EMORY.

Witnesses:

J. M. RAGSDALE, SHELA ERBANKS.

Copies oi this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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