US781493A - Screen. - Google Patents

Description

No 781,493 l PATENTEDJAN. s1

J. ,GLEMB'NTS & G. KNOWLING.

SCREEN. v

PPLIoATIoN FILED JUNE 6. 1.904.

sums-santi' 1.. l

No. 781,493. i

" J. GLEMBNTS & G. fxNowlLlNa.

` SGRBEN. l APRLIOATION FILED .TUNEIGl 1904.

PATENTED JAN. 31,1905..

I UNITED STATES Patntea January s1, 1905.

PATENT.l OFFICE.

SCREEN.

SPECIFICATION forming part of Letters Patent No. 781,493, dated January 31, 1905.

Application iiled June 6, 1904. Serial No. 211,382. l

To (LZZ whom t may concern,.-

Be it known that we, JAMES CLEMENTS and GEORGE KNowLING, subjects of the King of Great Britain, residing at Goat Wharf, Brentford, county of Middlesex, England, have invented a certain new and useful Improvement in Screens, of which the following is a speciiication. f

This invention relates to a screen for screening coal, gravel, sand, iiour, grain, and other powdered or granular materials.

The important feature of our improved screen is the provision of aseries of transverse horizontal bars or wires arranged in a frame adapted to be inclined at any desired angle in combination with a plain or unperforated surface on which the material to be screened is caused to fall or is thrown and from which said material slides over the bars aforesaid. Inv so sliding the material is. screened to a grade depending on the inclination of the frame. The bars or wires are usually loose in their supports and are free to rotate, whereby they keep themselves c lean.

Referring to the accompanying drawings, which illustrate our invention, Figure 1 is a front View of the screen. l Fig. Q'is a longitudinal section thereof on the line m Fig. l. Fig. 3 is a side view, drawn to a larger scale, of Aa portion of one side of the frame, showing the bearing .for the wires or bars. Fig. L is a section on the liney y, Fig. 8. Fig. 5 is a front view of a modified form of screen.

' Fig. 6 is a longitudinalcentral section of said 1 or supports B, by which it can be set and supported at any desired inclination.

C C are rods or wires extending transversely across the frame from side to side and forming the screen proper.

D is a plain or unperforated surface immediately above the wires or rods, on which surface the materials to be screened are allowed to fall or are thrown. Said materials then slide down said plain surface and over the wires or rods, and the finer particles thereof pass through the screen, while the coarser particles fall down in front of the screen and collect at the foot thereof. .The effective width of the openings between the wires or rods can be varied by changing the inclination of the frame. The'greater the angle the less is the 'effective width and the less the angle the greater is the effective. width, so that by tilting the frame more or less the character of the screening can be varied. We provide theframe with side wings E and in some cases with a top wing F, and preferably the wires or rods do not extend to the bottom of the frame, a plain part Gr being provided partly to separate the screened heap of materials from the coarser materials and partly to assist in holding the sides of the f frame together.

The wires or rods C are in most cases not held tight in their bearings, but are quite slack, as shown in Figs. 3 and 4. By this arrangement, the rods can move about and rotate, and in this way the accumulation on them ofthe material being screened is prevented. We may provide rods or wires of circular ortriangular or other section. A triangular-shaped rod is very advantageous in that it facilitates the lrotation thereof and the throwing of the material to be screened from one rod to the next. The bearings of the wires or rods are formed by holes J in bearing-plates K, secured to the sides of the frame A. For large screens it may be necessary to support the transverse wires or rods by one or more longitudinal bearing-bars. In Fig. 5 we have shown one such bearing-bar L, extending down the center of the frame. The holes M,- Fig. 6, in the bar L, through which the wires pass, are elongated, so that the wires can move about, as above described.

ln some cases we provide the screen with a hopper N, Figs. 5 and 6, at its upper end, into which the materials to be screened are thrown and from which said materials fall onto the plain surface D of the screen. The outlet of said hopper is shown furnished with a hinged iiap P, controlled by a handle Q, and notched quadrant R, by which the opening can be varied as desired, i f

For screeningvery fine materials where fine wires are necessary the wires are very liable to bend unless held tight. In such cases they are not allowed to shake about` but are secured at their ends and preferably are tightened by moving their intermediate bearings S longitudinally to bend the Wires, as indicated in Fig. 7

What We claim isl. The combination of a frame having perforations at the sides elongated in the direction ofthe plane of the frame to receive transverse Wires or rods loosely mounted therein and movable in their own plane, said Wires or rods, and a plain surface above and in the same plane as said Wires or rods, substantially as described.

2. In combination, a frame having holes JAMES (ELEMENTS. GEORGE KNOVVLI N (Jr.

Witnesses:

JOHN T. KNoWLEs, ALEXANDER W. ALLEN.

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