US412741A - Ore-separator - Google Patents

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US412741A US412741DA US412741A US 412741 A US412741 A US 412741A US 412741D A US412741D A US 412741DA US 412741 A US412741 A US 412741A
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    • B03B4/00Separating by pneumatic tables or by pneumatic jigs
    • B03B4/005Separating by pneumatic tables or by pneumatic jigs the currents being pulsating, e.g. pneumatic jigs; combination of continuous and pulsating currents


2 Sheets-Sheet 1.
No. 412,741. Patented Oct. 15, 1889..
VVNHESES (No M'qdel.) 2 Sheets-Sheet 2 J. B. FREEMAN.
Patented 001:. 15, 1889..
Witnessss Q I I j 6L. v 5517101" v I i N PETEfis. Phuto-iimu ra hun wm n ton. ac.
SPECIFICATION forming part of Letters Patent No. 412,741, dated. October 15, 1889.
Application filed November 28, 1887. Serial No. 256,355. (No model.)
To all whom it may concern.-
Be it known that 1, JAMES B. FREEMAN, a
I citizen of the United States, residing in the rators in which the separation of the gold ary apron F.
from the dbris is accomplished by the use ofv air.
The object of my invention is to improve the class of gold-separators which. treat dry granular ores, and to render them more use-- ful and efficient, to obtain a larger percentage of precious metals from the ores subjected to their treatment, and it relates to certain improvements in mechanism for feeding the material from a hopper to the apron through which air is forced to effectthe separation, also to the construction of the apron, and to the combination ofsaid mechanism, as hereinafter more particularly set forth.
My invention also comprises the peculiar construction of the apron and the combination of the several parts, as'herein set forth.
The accompanying drawings illustrate my invention.
Figure 1 is a perspective view of my improved gold-separator, showing the rear and side of the machine. Fig. 2 is a front perspective view showing the other side of the machine. Fig. 3 is a. vertical longitudinal midsection of Fig. 2, somewhat enlarged. Fig.4 is a view of the frame of the apron. Fig. 5 is a cross-section of the apron online 1 y, Fig. 4'. Fig. 6 is adetail view illustrating the construction of the apron. Fig. 7 is a cross-section of the machine on line a: 00, Fig. 3, showing the feed-valve as it is at the close of the downward stroke of the pitman.
A is the box or frameof my machine.
B B are two bellows, the air-chambers O O of which are separated by a stationary partition D.
E is an air-chest located under the station- The floor of the ail chestforms a partition between the air-chest and the bellows B B. A valve-opening G through the floor of the air ohest communicates with one of the bellows, and a corresponding open= ing G communicates with the other bellows.
These, openings for the ingress of air from the bellows to the air-compressing chest are provided with valves H H. i
The top leaf I of the upper bellows and the bottom leaf 1' of the lower'bellows are connected by a rod J of such length that when the upper leaf I is raised to fill the upper bellows with air the leaf 1 will be drawn up to the fixed partition D, which is the bottom of one and the top of the other bellows, and force the air out of the lower bellows, the upper bellows being at the same time opened to receive its supply of air, which will in like manner be forced into the chest upon the re verse motion of rod J actuated by pitman K, connected to the top leaf of bellows B. Gearing is employed to effect these operations. A brief interval between the alternating blasts of a the bellows, caused by the pitman passing the dead-center at each revolution of the crank, and the connection of the two bellows by the rod J will be momentary, but will produce a perceptible vertical vibration and agitation of. the mass of material to be separated, while the same is being held in suspension above the apron by the continuous force of the volume of air passing through the apron. The ends of the ribs d are set firmly in the frame f, and the wire-cloth with the riffles thereon and its lining are tacked to the frame, the ribs (1 serving to support the apron and prevent it from sagging.
0 denotes the stationary feed hopper, mounted above the upper end of an inclined screen P, the lower end of which screen is pivoted to the frame of the machine by bolts Q Q, and is vibrated by the action of the upper end of pitman-rod K, which strikes bumperY at each revolution of its crankshaft and shakes the screen P, causing the I is constantly forced through the apron.
.the top of bellows B.
are denoted by letters U and V, the former being attached to valve T at one end and to lever V at the other; and the latter, being hinged to the former, is capable of adjustment in notches of rack-barlV, secured upon The spiral spring t, connecting the middle of lever U with the top of bellows B, serves to hold the valve T, to which lever U is fastened, up to the valveopening when not opened by the action of the top of bellows B, which actuates lever V.
The bumper Y is attached to the end of the screen P by a bolt 1", secured to the screen and passed through a slot .9, and provided with a nut it. By this arrangement the bumper may be so adjusted as to give a greater or less motion to the end of the screen.
The apron is inclined from the hopper downward to the tail of the machine, and is provided with riffles a a 0.", extending across it for the particles of gold to lodge against.
The letter 1) indicates an opening at the lower end of the apron for the discharge of the dbris.
The apron is formed of fine wire-cloth and lined underneath with muslin of ordinary texture, and as the top of the air-chestit will in a measure obstruct the passage of air, whereby the air is always kept under compression in the chest while the bellows are in operation, although a strong volume thereof The riffies across the apron are each formed by first making a fold in the wire-cloth, inserting a strip of tin therein, then covering the fold and strip of tin within it by an inverted-V-shaped piece of tin, which, to complete the work, is securely compressed thereon.
I will now describe more clearly the operation of the machine.
The shaft X is rotated, and the auriferous material in a granulated condition is put into hopper O, and passes onto screen P and slides down thereon. The liner portion, falling through the screen, is received by feedbox R, and the coarser portion passes oif at the end of said screen. Theend of pitman K, striking bumper Y, agitates the material on the screen to produce this result. The
movement of the top leaf I of the bellows actuat-es the levers V and U to open and close valve T, agitating and causing the auriferous material to fall upon the apron F, when, becoming'subjected to the varying force of the volume of air passing through the apron, it is buoyed up or suspended and opened or partially separated to permit the particles of gold commingled therewith to fall by their greater gravity upon the apron,'where they are retained by the rifiies thereon, while the remaining lighter portion of the materials will be carried by the continuous volume of air in an undulating sheet to the opening an and discharged. \Vhen the pitman K reaches and passes the dead-center of its rotation, the blast from the lower bellows ceases and that from the upper bellows begins, permitting, however, a slight intermission between the blasts, during which intermission the compressed air within the chest continues to exert its power, forcing the volume through the apron F, and thus the vibratory motion ,of the material suspended above the apron is pro- I duced.
It will be understood from the foregoing description of the organization ,of the machine that the condensation and pressure of the air in the chest F is constantly maintained with varying degree by the use of the valves between the air-chest and the bellows, which valves cannot be raised against the expansive power of the compressed air within the chest until the bellows have become partially closed, whereby the air contained therein has also become condensed sufficiently to exert the necessary force against the valves to raise them. 7
Havingdescribed myinventiomlclaim and desire to secure by Letters Patent- 1. The feed-box R and valve T, in' combination with levers U and V, rack-bar W, and movable leaf I of bellows B, as described.
2. The improved apron for gold-separators, comprising the frame, the rifiles a a a a', bent into the form of an inverted trough, the wi re-cloth N, fastened to the frame and pressed into the said riflies, the strips of tin e, enter-' ing the said riflies and fastening the wirecloth therein, the ribs (1 d, notched on the under side, said notches fitting over the said riftles and holding them in place, and the muslin or canvas strip m, fastened to the bottom of the frame, substantially as described.
3. The combination of the feed-boxR, valve T, provided with the levers U and V, bellows B B, valves H H, air-chest E, and apron F.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642180A (en) * 1985-05-28 1987-02-10 Kaufman Norman H Portable apparatus for the recovery of placer gold
US20020078777A1 (en) * 2000-12-27 2002-06-27 Witucki David E. Gear assembly
US20090193577A1 (en) * 2008-02-05 2009-08-06 Nikolai Eiteneer Universal face wash and care station

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642180A (en) * 1985-05-28 1987-02-10 Kaufman Norman H Portable apparatus for the recovery of placer gold
US20020078777A1 (en) * 2000-12-27 2002-06-27 Witucki David E. Gear assembly
US20090193577A1 (en) * 2008-02-05 2009-08-06 Nikolai Eiteneer Universal face wash and care station

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