US493142A - Sifter or separator - Google Patents

Description

(No Model.)

C. ZIMMER1VIA1\I.y SIPTBR 0R SBPARATOR.

Patented Mer. -7, 1893.

l Ilvil, A.

@Nimah STATES ATENT Ormea.

CASPER ZIMMERMAN, OF DENVER, COLORADO.

slFTER 0R sPARAToR.

SPECIFICATION forming part of Letters Patent No. 493,142, dated March 7, 1893.

Application filed May 3, 1892. Serial No. 431,707. (No model.)

To all whom it may concern.

Be it known that I, CASPER ZIMMERMAN, of Denver,in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Sifters or Separators; and I do hereby declare the following to be a full, clear, and exact description ot' the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to certain new and useful improvements in mining machines, and has for its object the production of a new and highly el'licient machine of this class for mining gold and other precious ores whereby the ore is readily and easily separated in a dry state from the pay gravel with but a `minim u m waste.

The invention comprises an inclined Sieve having a lower receiving trough and provided with a series of parallel bars spaced apart and having opposite inclined faces, said bars being widened at their upper portions and narrowed at the bottom.

The invention further consists in a sieve having a lower trough, a series of bars having inclined sides provided with metallic strips, spacing blocks placed between said bars at periodical points, and bands or straps inclosing said bars and spacing blocks both above and below, the upper bandsor straps serving to impede the ore in its passage, both of said bands or straps being connected at their ends to the parallel sides of the sifter, substantially as hereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawings:-Figure l is a View in side elevation of my improved mining machine. Fig. 2 is a plan view of the sifter or separator. Fig. 3 is a transverse sectional view thereof on the line :v -9c, Fig. 2. Fig. 4 is a View of a portion of one of the bars.

' Referring to the drawings, A designates the frame-work or staging of ordinary construction, preferably formed in sections so that its height can be regulated. In the upper portion of this frame-work or staging is an inclined feed chute a having side guide rails a.

B is a hoisting bucket designed to be lowered into the point of excavation and raised therefrom when filled by means of a rope or chain a2 passed over a sheave-wheel or pulley cts suspended from a top cross-bar of framework A, the other end of said rope or chain being connected to the lwindlass of any suitable engine or motor (not shown).

O designates my improved sifter or separator, and b, b, parallel side-bars or boards thereof, to the undersides of which are secured hooked plates b designed to be placed in engagement with a cross-bar b2 of framework A at a point just below the discharge end of feed chute a. These side-bars or boards are braced or held together at their ends by strap irons d.

Between the side-bars or boards of the sifter or separator is a series of spaced apart bars D, which extend throughout the length of the sifter or separator, the length of the latter being regulated by the extent of the lincline where themachine is located. Each of these bars is ot' approximately V-shape in cross-section, and to their sides are secured metallic strips or plates d to prevent the gravel or stone from wearing on said bars. These bars which constitute the bottom of the sifter or separator are spaced apart at periodical points by-suitable spacing blocks d2, which conform to the shape of the bars D. At the points of location of these spacing blocks the bars Dl and said blocks are supported by corresponding U shape plates E,-E, the former passing beneath or over the underside of said bars and blocks and having its vertical ends bearing against the inner sides of boards b, their extreme upper ends being flanged so as to rest on the upper edges of said boards. The U-shape plate E is passed over the upper surfaces of bars D and the spacing blocks, and their vertical ends are held against the vertical ends of plates E by means of nutted bolts e which are passed through said plates and coincident holes in side-boards b. The upper U-shape plates E in addition to holding the separating bars and blocks in place also serve as checks to prevent the ore and gravel from sliding continuously down the inclined plane and cause such ore and gravel to turn upon coming in contact therewith, thus aiding in the separation of the ore.

F designates atrough of approximately U- shape form, in cross section, suspended by straps f from the side-boards b of sifter or separator O. This trough extends beneath the separating bars D throughout the length thereof to a point near the outer, lower end, of the sifter or separator, and is designed to receive the ore separated from the pay gravel. This sitter or separator can be supported at its outer end by any suitable means, but I prefer to em ploya frame f upon the top crossbar of which the end of said sieve or separator will rest, grooved plates f2 being attached to the side-boards b to hug the upper crossbar of said frame. The inclination of the sifter or separator will depend upon the condition of the paygravel. It' the latter be damp and sticky a greater pitch or inclination should be given the sieve or separator, nd a lesser inclination when the gravel is The pay-gravel to be treated is elevated by means of the hoisting bucket, and upon being dumped onto the inclined feed chute will pass on to the inclined sitter or separator, and in its travel over the latter the ore will be sepav rated and fall into the trough beneath, from which latter it will pass into a pan G located beneath the discharge end of said trough at a point between frame-Work A and supporting frame f. The gravel or unsifted matter will pass oi the outer projecting end of the sifter or separator.

The advantages of my invention are apparent to those skilled in the art to which it appertains, and it will be especially observed that no stream or supply of wateris necessary to effect the separation of the ore, and that in the single passage of the pay gravel over the inclined surface of the sifter or separator the gold or other precious metal willbe separated from the gravel and collected in a suitable pan by which it can be conveyed to an amalgamator, not shown. It will also be observed that by shaping the bars of the sifter or separator as described, the thorough sifting of the material is effected, and said bars are protected from wear. It will be further observed that by placing the upper straps of the spaced apart bars over the top-surfaces of the latter the agitation of the gravel and the separation of the ore are greatly aided.

I claim as my invention- 1. As an improvementin mining machines, the sfter or separator herein-described having a series of spaced-apart bars provided with metallic plates on their sides, spacing blocks located between said bars, and upper and lower plates extending across said bars and holding said blocks as set forth.

2. As an improvementin mining machines, the sifter or separator herein-described, having a series of bars of approximate V-shape, said bars being provided with metallic plates on their sides, and the upper and lower plates attached to said sifter or separator and supporting said series of bars as set forth.

3. As an improvement in mining machines, the sifter or separator herein-described comprising the parallel side-boards, the series of bars between said sideboards, the spacing blocks located between said bars, and the upper and lower U-shape plates supporting said bars and blocks and having their vertical ends secured to said side-boards, and the trough beneath'said sitter or separator to which it is connected, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

CASPER ZIMMERMAN.

Vitnesses:

WM. H. ANDREW, V. J. DOLEZAL.

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