US153738A - Improvement in coal screens and slaters - Google Patents

Description

l. BEADLE.

Goal-Screens and Slaters. V Patented Aug 4,1874.

U NITED STATES PATENT OFFICE.

IMPROVEMENT IN COAL SCREENS AND SLATERS.

Specification forming part of Letters Patent No. 153,738, dated August 4, 1874; application filed April 30, 1874.

To all whom it may concern:

Be it known that 1, Jesse BEADLE, of Shickshinny, in the county of Luzerne and State of Pennsylvania, have invented certain new and useful Improvements in Goal-Screens; and I 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 pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to an improvement in coal-screens and it consists in placing around the screen a cage of triangular bars, which extend at right angles to the length of the screen, and which bars serve to separate the slate from the coal, as will be more fully described hereafter.

The accompanying drawing represents a longitudinal section of my invention.

a represents an ordinary coal-screen, which is secured to a revolving shaft in the usual manner, by means of the arm'c. This screen is divided into sections, the first one, 13, of which is sufficiently fine to separate the slack from the coal before the slating begins, and then the sections become coarser and coarser toward the end of the screen, so as to separate the different sizes of coal. Around the screen is place a cage, (1, composed of annular bars, triangular in their cross-section, and having their "ertices pointing inward toward the center of the screen, the spaces between the bars being of less width than the meshes of the corresponding part of the screen a, and

of the same width, or nearly so, as the meshes of the section next preceding it.

As the coal is poured into the screen, the slack is sifted out in the first section or sections, 2', before reaching that part where the slating process begins. As the coal reaches the various sections, around which the cage is placed, all the lumps of coal and pieces of slate that are smaller than the meshes of the screen fall through upon the cage beneath, the bars of which, having their sharp edges turned inward, have a constant tendency to turn the pieces of slate up upon their edges, when they at once slip through between the bars and escape, while the coal, being of a size too large to fall between the bars, passes on to the receptacle prepared for it.

Where it is desired to extend the screen to any length, and have it separate a number of different sizes of coal, there will be suitable openings made in the cage at the end of each section, to allow the coal to be discharged into its pocket.

I am aware that a screen composed of triangular bars is not new; but never before has a cage of these bars been placed around the outside of a screen for the purpose of slating the coal, as described.

Having thus described my invention, I claim- 1. A combined coal screen and slater, constructed and arranged in themanner described, consisting of the screen a i and cage d, the cage being composed of triangular bars having their vertices turned inward, which extend around the screen at right angles to its length, substantially as shown and described.

2. The arrangement of slater-bars beneath or outside the coal-screen, in the manner and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 13th day of April, 1874.

JESSE BEADLE.

Witnesses:

CHAS. A. BOONE, Geo. W. SMITH.

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