US783221A - Concentrating apparatus. - Google Patents

Description

No. 783,221. PATENTED FEB. 21, 1905.

0. B. PERRY.

GONGENTRATING APPARATUS.

APPLICATION FILED NOV. s. 1903.

2 sunning-sum 1.

PATENTED FEB. 21, 1905.

0. B. PERRY.

GONOBNTRA'I'ING APPARATUS.

APPLICATION FILED NOV. 5. 1903.

2 SHEETS-8HEET 2.

Patented February 21, 1905.

PATENT Orricn.

OSCAR BUTLER PERRY, OF SAN FRANCISCO, CALIFORNIA.

CONCENTRATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 783,221, dated February 21, 1905.

Application filed November 5, 1903. Serial No. 179,909.

To :LZZ whom, it may concern.-

Be it known that I, OSCAR BUTLER PERRY. a citizen of the United States, residing in the city and county of San Francisco, State of California, have invented certain new and useful Improvements in Concentrating Apparatus; and I do hereby declare thefollowing to be a 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.

My invention relates especially to concentrating apparatus for gold-dredging machines, and has for its object to provide an improved distributing device to be located between the screen and the collecting or saving tables, which distributer is adapted to receive the gold-bearing material from the screen and distribute the same in substantially equal quantities to the several collecting-tables, so that each table will receive its proportionate share of the material and the liability to overload any given table is avoided.

In dredgework the gold-bearing material is fed from the main discharge-hopper to a screening device which screens out the fine material carrying the gold and discharges the tailings. As the material is fed on at the upper and forward end of the screening device it is found that most of the line gold-bearing material passes through a relatively small sectionvia, the first few feet of the screen at the upper end thereofso that practically all of the valuable material is delivered to the first few collecting-tables only, with the result that these tables become overloaded and much of the gold in the material fed to said tables is washed away by the water flowing thereover and is lost.

It is the purpose of my invention to avoid this overloading of the first collecting-tables and to distribute the material, which passes almost exclusively through the initial portion of the screen, to all of the tables, so that the fine material on any one table is approximately equal in quantity and amount of gold contained therein to that on any other table.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a fragmentary side elevation,

partly in section, of a gold-dredging machine embodying my improved distributer. Fig. 2 is a side elevation of the distributer, illustrating the manner of connecting the separable sections. Fig. 3 is a plan view thereof, and Fig. 4 is a transverse section through the distributer.

Referring to Fig. 1 of the drawings, 1 represents the hull of-a dredge-boat of any ordinary or preferred construction. The particular dredge illustrated is of the bucket-chain type, in which an endless chain of excavatingbuckets 3 discharges the material brought'up from the stream-bed into a hopper 2, from which the material is fed to suitable screening devices, which screen out the fine goldbearing material and discharge the tailings or waste material into a hopper 6, from which it is taken by a conveyer 7 to the dump or other place of deposit. The screening device shown comprises two inclined vibrating screen-sections t 4, which are constructed and operated in a manner well'known to those skilled in the art. Spray-pipes 9, supplied from a pump 8, distribute wash-water in suitable quantities to the screen-sections to wash the fine material through the meshes thereof, after which the screened material is caught upon a series of collecting or saving tables 11 11, the tables being preferably arranged in pairs inclining laterally in opposite directions, as indicated in Fig. 4:, and the pairs of the series being successively arranged, preferably, in stepped relation, as indicated, in order to bring the various tables in proper relation to the screens.

- Between the screen-sections i and the collecting-tables 11 is mounted a distributer which receives the fine material from the screens and delivers the same in substantially equal quantities to the several tables 11, by means of which the heavy particles of gold are caught and held in the usual riftles, while body of the section next in the rear.

series of troughs ff, which overlie the several pan-sections preferably in parallel rows on each side of the basins b b and have their lower ends bent inward to discharge into the individual pan-sections, preferably in proximity to the outlets 0 of the respective basins. It is to be observed that while each pan-section a is substantially horizontal the several sections forming the series are successively arranged in stepped relation, so that the troughsffi which rest upon the pan-sections, are inclined sufficiently to cause the material from the screens to pass freely along to the discharge ends f f thereof. Each section a is formed of sheet iron or steel and is strengthened by suitable stays and angle-irons. The sections, which are secured end to end in number corresponding to the number of pairs of collecting-tables to form a distributer extending the entire length of the series of tables,

are joined together by riveting the rearwardlyprojecting ends of the edge stays e e to the The distributer thus formed is a rigid stepped panlike structure held intermediate the screens 4 4 and the tables 11 11 by suitable rods or hangers attached to the supporting-framework from which the screens are suspended.

In order to facilitate the washing operation and the discharge of the gold-bearing material from the pan-sections, each of said sections is provided with a separate water-supply from jets 10 10 on pipe 10, leading from pump 8.

The operation of the mechanism above described is as follows: The material brought up by the excavating-buckets 3 is dumped into hopper 2, from which it is delivered upon the vibrating screens 4 4, where it is subjected to streams of water from pipes 9. Most of the fine material containing the gold passes through the first few feet of the upper screen, while the coarser tailings pass down the screens and are finally discharged into hopper 6 and carried to the dump by conveyer 7. The fine material falls upon the distributer in such a manner that substantially equal portions thereof are caught in the basins of the two upper pan-sections and the respective troughs f resting thereon. That caught in the basins is washed out and falls upon the first series of collecting-tables, while that falling in the various troughs is carried down said troughs and discharged from the outlets f f thereof into the basins of corresponding pan-sections a a, from which it is washed by water from the nozzles 10 10 upon the subjacent tables 11. It will thus be seen that each table receives a proportionate share of the gold-bearing material, and instead of the first tables being overloaded, while those later in the series receive little or no material, as is the case when the old types of' distributers are employed, all of the tables receive equal amounts of the material from the distributer, so'that the operation of separating and collecting the gold is carried on under conditions of greater efficieney and economy.

While the distributer has been described as applied to a fiat shaking-screen apparatus and a particular arrangement of collecting-table, it is to be understood that it is in no wise limited to such application, as it is essentially a self' contained apparatus adapted to subserve the same function in connection with many other forms of combined screening and concentrating machines.

Having thus described my invention, what I claim is 1. In a concentrating apparatus, the combination of a screen, a series of collecting-tables located below and arranged successively lengthwise the screen, a distributer compris ing a series of independent pan-sections successively arranged and located between the screen and tables, and a plurality of independent troughs extending from the receiving end of the screen lengthwise along the series of pans and tables, all of said troughs leading from a common receiving-point and delivering separated portions of the material to separate pans at different distances from said point.

2. In a concentrating apparatus, the combination of an inclined screen, a series of successively-arranged independent collecting-tables located below the screens and inclined laterally with respect thereto, and a distributer arranged intermediate the screen and tables, said distributer comprising a series of independent pan-sections corresponding to the collectingrtables beneath, a plurality of independent troughs located between the pans and the screen and extending from the upper end of the latter over and along the series of pans, all of said troughs leading from a common receiving-point, and individual troughs delivering to the several pans at different distances from said point and from the upper end of the series.

3. A distributer for concentrating apparatus, comprising a series of successivelyarranged independent pan-sections, each provided with an outlet, and a plurality of independent troughs extending lengthwise the series of pans from a common receiving-point and delivering separated portions of the material to the several pans at different points.

4:. A distributer for a concentrating apparatus, comprising a series of independent pansections arranged successively in stepped relation, and each provided with an outlet, and a plurality of inclined independent troughs overlying the pans and arranged lengthwise the series thereof, individual troughs delivering separated portions of the material to separate pans at different points, and all the troughs extending from a common receiving-point.

5. A distributer for concentrating apparatus, comprising a series of independent pansections arranged successively in stepped relation and each having a central basin or depresclined laterally of the screen in opposite directions, and a series of independent pan-sections I 5 successively arranged lengthwise and above the series of tables and centrally with respect to individual tables, each pan having a central depression with discharge-outlets to a given pair of collecting-tables, and each pan having 20 also a separate water-supply.

In testimony whereof I aflix my signature in presence of two witnesses.

OSCAR BUTLER PERRY.

Witnesses:

MAURICE E. GRIFFIN, GERTRUDE JOHNSON.

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