US43185A - Improvement in coal-screens - Google Patents

Description

UNITED STATES PATENT OFFICE.

JOHN R. DEIHM AND JASPER SNELL, OF POTTSVILLE, PENNSYLVANIA.

IMPROVEMENT IN COAL-SCREENS.

Specification forming part of Letters Patent No. 13, l S5, dated June 21, 1864.

To all whom zt 'may concern:

Bo it known that We, JOHN R. DEIHM and JASPER SNELL, of Pottsville, in the county of Schuylkill and State of Pennsylvania, have invented a new and useful Im provement in the Construction of the Cylindrical Coal-Screens; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being' had to the accompanying drawings, making a part of this specitication, in which- Figure 1 is a longitudinal central section of our invention, a; a', Fig. 2, indicating the plane of section Fig. 2, a transverse section of the I same, taken in the line y y, Fig. i. I

Similar letters of reference indicate corresponding parts in the two figures.

This invention consists in constructing the screen ot' a series of segments, composed ot' longitudinal cast-iron bars, connected by transverse wrought-iron rods, the former being cast on the latter, so as to obtain a tirm connection ot' the parts, the segments beingV attached to bands at their ends, and all arranged as hereinafter fully shown and described whereby a very superior coal screen is obtained, in consequence ofthe parts being always retained in proper position, and a free escape allowed for the coal and dirt, while the segments are rendered capable of being c'urved or bent to suit the required diameter of the To enable those skilled in the art to fully understand and construct our invention, we will proceed to describe it.

A represents a series ot' segments of which the screen is composed. These segments are formed each of longitudinal cast-iron bars a, (four, more or less,) the outer surfaces of which are straight, and the inner surfaces provided with projections b.

c represents wrought-iron rods, which pass through the bars a at right angles, and at suitable and equal distances apart. The rods c have the longitudinal bars c cast on them, the former being placed in the molds and arranged in such a manner as to obtain this result when the bars a are cast. By this means a very firm connection of the bars a and rods c is obtained, as the bars c in cooling will shrink firmly on the rods c, and the latter, and

also the bars a, will be eiiteetually prevented from slipping out of a proper relative position with each other. The longitudinal cast-iron bars a are cast rather wider at their ends than at any other point, and these Wide portions (designated by d) have recesses c in them to receive bands B, through which bolts j' pass, said bolts also passing through bands O, on which the ends of the segments rest, and which serve to retain the segment in proper position in the form of a cylinder.

Besides the rmness with which the bars c and rods c are secured together, the invention possesses the advantage of alldwing the segments A to be bent or curved to form screens ot greater or less diameter, as may be required. The openings also of the screen admit of the coal and dust passing freely through them. The screen may be economically manufactured, and it will be extremely durable, there being no parts that can be casually displaced.

Having thus described our invention, we claim as new and desire to secure by Letters Patent, as an improved article of manufacture- A cylindrical coal-screen composed of a series of segments, constructed and connected together in the manner substantially as herein set forth.

' JOHN R. DEIHM.

JASPER SNELL. Witnesses:

WM. L. YoDER, W. R. MORTIMER.

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