US269173A - Dredging-machine - Google Patents

Description

(No Model.)

2 Sheets-Sheet 1.,

W. H. BROWN & W. H. BELL.

DREDGING MACHINE.

Patented De0.19,'1882.

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(No Model.) I 2 Sheets-Sheet 2.. WQH. BROWN 81; W. H. BELL.

DR-EDGING MACHINE. No. 269,173. r Patented Dec. 19, 1882.

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" UNITED STATES WlLLIAM BROWN AND WILLIAM H.

DREDGING- BELL, OF NEW ORLEANS, LOUISIANA.

MACHINE.

SPECIFICATION forming part of Letters Patent No. 269,173, dated December 19,, 1882 Application filedMay 4, 1882. (No model.) 7

in the parish of Orleans and State of Louisiana, have invented certain new and useful Improvements in Dredging-Machines; and we do hereby declare the following 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, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention is designed as an improvement upon the apparatus or means for removingalluvialdeposits in rivers and other streams as shown and described in the application filed by William H. Brown and William H. Bell on the 20th day of October, A. D. 1881, and allowed on November 11, A. D. 1881.

Our improvement consists in the novel construction of a cylinder mounted upon a shaft and provided with teeth or stirring devices,

constituting a revolving harrow.

Our improvement further consists in constructing a cylindrical skeleton frame composed ofstrips arranged spirally, so as to cross each other, and lining a portion of the outer endsof the cylinder, sothat the material raked or harrowed from the bed of the stream and held in suspension will be drawn inward at the center by the revolving propellers and forced outward at right angles to the current.

Our invention further consists in providing the longitudinally central portion of 'the revolving harrows with a grooved pulley or collar to receive an endless driving-chain.

Our invention further consists in the novel construction, combination, and arrangement of parts, as will be hereinafter more fully set forth and specifically claimed. a

In the accompanying drawings, Figure 1 shows a side elevation of the front portion of a dredging-boat with our improvements attached thereto for removing the obstructions in a stream. Fig. 2 is a plan view of the same, showing the propelling or driving means more fully. Fig. 3 is a perspective view of the revolving harrows with their adjuncts, and Fig. 4 is a longitudinal sectional viewof a portion of the revolving barrows.

The letter A (see Figs. 3 and 4) represents a cylinder composed of two series of strips, a

b, which are arranged spirally in opposite directions, the series a being provided with a plurality of fingers, arms, or teeth, 0.. These strips are rigidly attached to the cylinderbands d in any suitable manner, and these bands are supported upon theshaft B by means of the arms or spokes edattached to the hubs f, thus constituting or forming a skeleton cylinder, which we term a revolving harrow.

The letter D represents cylindrical casings, which are arranged on the inside of the skeleton-cylinder frame, each occupying about onethird of the entire length of the skeleton cylinder, so as to leave an intermediate or middle latticeopen portion for the free ingress of the material held in suspension by the water, and which is to be discharged sidewise through the open ends.

The fingers or teeth 0, which may be made of any suitable material and shape best suited for the purpose, are formed with screw-threads on the ends to receive jam-nuts, by which they are secured in the strips of the cylinder and casing, and at the same time the jam-nuts act as bracing or stiffening means. (See Fig. 5.)

Mounted on the shaft B, and keyed or otherwise attached thereon, are the propellers E, which may be made after any of the wellknown patterns. These propellers are arranged on the shaft within the cylindrical casings D, so as to be protected from obstruction or rubbish, and produce the desired effect of- I stantially the same as set forth in our appliet-wheels, and driven by sprocket-chains pass- I in'g over sprocket-wheels on the ends of the shaft F, located on the dredging-machine.

The letter G represents an annulus or ringpulley embracing the cylinder and centrally arranged thereon. It is formed with a groove to receive a chain or driving means extending to and operating in the grooved pulley h, fixed on the shaft F, the object of this arrangement being to give the cylinder revolution independently of the propellers, and, as will be observed from the proportion of the drivingwheels, connecting the shaft. The cylinder has a slower motion than the propellers. This difference of speed creates the desired suction which draws the material loosened through the openings of the cylinder and within the same, to be discharged as hereinbefore described. Thejournals ot' the rotary harrow operate in Outriggers, which are capable of beinglowered or elevated to suit the condition of the work.

The operation and the motive power are,sub-

cation hereinbefore referred to.

We reserve the right to slightly vary the construction of the revolving harrows and the means for operating the same, and to employ such motive powers as may be deemed advisable and suitable for the purpose.

What we claim as our invention, and desire 0 to secure by Letters Patent, is-

1. A hollow cylinder for removing alluvial deposits, composed of the spirallyarranged strips, end lining-sections, and peripheral stirring devices, with internally-arranged means for creating end currents, substantially as described.

2. In an apparatus for removing alluvial de- 45 3. A revolving harrow, constructed substantially as described, provided with the centrallyarranged pulley for receiving the endless driving-chain, substantially as described, and for the purpose set forth.

. In testimony whereof we affix our signatures in presrnce of two witnesses.

WILLIAM H. BROWN.

WVILLIAM HENRY BELL.

Witnesses: O. G. REB ENTISOH, KENTON RossER.

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