US2072725A - Shaking screen - Google Patents

Description

I March 2, 1937. w. WETTLAUFER SHAKING SCREEN Filed April 50, 1952 2 sheets-sheet 1 .Zzzrenioz;

a wax, vqfior zy March 2, 1937.

W. L. WETTLAUFER SHAKING SCREEN Filed April 30, 1932 2 Sheets-Sheet 2 Invenfin;

Patented Mar. 2, 1937 PATENT OFFICE SHAKING SCREEN William Louis Wettlaufer, Buffalo, N. Y., assignor to The W. S. Tyler Company, Cleveland, Ohio,

a corporation of Ohio Application April 30, 1932, Serial No. 608,436

10 at high speeds, and which not only produces a very eificient separation of the plus and minus materials but effectually maintains the screen meshes open at all times.'

Another object of the invention is to provide a heavy duty screening machine of this character which has been designed for maximum production and which is provided with simple and effective means for yieldingly resisting movement of the live screen body out of its normally balanced state, and for maintaining the same in correct screening position and without affecting the positive gyration thereof.

In the accompanying drawings:Figure 1 is a perspectiveview of a screening machine embodying my invention. Figure 2 is a side elevation thereof. Figure 3 is an enlarged fragmentary cross section thereof taken on line 33, Figure 2. Figure 4 is a similar view taken on line 4-4, Figure 2.

Similar characters of reference indicate corresponding parts throughout the several views.

The screen body or live screen frame of the machine may be of any suitable and well known construction, that shown in the drawings, by way of example, consisting of side plates l0, l0 carrying upper and lower screening surfaces or decks II and I2 of coarse and fine mesh, respectively, the whole being supported for rotating or gyrating motion upon a suitable frame structure l3 which may be of any appropriate design. In practice, this supporting. frame and the live screen frame carried thereby are usually disposed in a more or less inclined position, as shown in Figure 2.

The live screen frame, as a whole, is balanced or supported for rotating vibratory movement midway of its ends by a rotary transverse shaft Hi joumaled at its ends in suitable bearings l5 supported on the main frame i3 and extending 50 through the side walls [0 of' the live frame at substantially its center of gravity. The shaftbearing'shown in Figure 3 of the drawings is of the heavy duty roller bearing type embodying the self-aiming feature and effectually sealed to ex- 55 elude grit and foreign matter by labyrinth seals.

This shaft constitutes the drive shaft for the machine and imparts to the live frame a positive, circular or gyrating movement whereby all points of the screening surface are vibrated in a circular path or orbit and to this end said shaft has ofiset or eccentric'portions l6 on which the live frame is supported, the latter having roller bearings I! attached to the side walls or platesilJ, l0 thereof in which the eccentric shaft portions are journaled.

For the purpose of maintaining the'machine in proper balance, I provide counter-balance wheels l8, l8 which are mounted on the eccentric shaft l4 preferably between the bearings l5 and I1 and which are provided with radially-adjustable weights |9 held in a set position by bolts 20. Applied to one end of the drive shaft is a pulley 2! which may be connected by a belt to an electric motor or other source of power.

In the heavy duty type of screening apparatus to which this invention relates, it is built in widths varying from four to six feet and in lengths" from eight to fourteen feet, and it is therefore necessary to employ resilient means acting upon the opposite ends of the live screen frame for yieldingly resisting movement thereof out of its normally balanced state and for maintaining such live frame in proper screening position irrespective of the load distribution thereover and without in any way disturbing or interfering with the positive gyratory movement transmitted to the live frame by the shaft M. For this purpose, the fore and aft portions of this live frame are preferably suspended over or supported upon a plurality of yieldable elements which may be in the form of compression springs 22 disposed in longitudinal rows at opposite sides of the shaft-axis, the several springs being of substantially the same size or capacity. As shown in Figures 1, 2 and 4, these springs are arranged in suitable housings 23 secured to the outer sides of the plates l0 and are seated at their lower ends on supporting bars 24 secured to the main frame iii of the machine, the springs being disposed in a substantially upright position between these parts to yieldingly sustain the ends of the live frame. By thisarrangement, it will be noted that the springs are disposed at different distances from the shaft-axis and in substantially horizontal alinement, with the result that the action of the several springs is uniformly distributed at different points lengthwise of the screen in such a manner that the sensitiveness of the live frame is not affected at any point nor is its balance disturbed or interfered with,

" to the live frame are preferably disposed along a line substantially intersecting the axis of the drive shaft l4 and parallel to the screen'surfaces of such frame, as seen in Figure 2, whereby the setting'up of disturbing forces is eflectually eliminated and the circular vibrating action of the live frame is positively maintained over its individually therebetween'ancl in a position at. substantially right angles to the screening surentire area.

I claim as my invention:-' Thecombination of a live screen frame, a stationary frame, a rotary supportingshaft for said live frame arranged substantially centrally and transversely thereof for balancing it and journaled at .its ends in said stationary frame,

frames, respectively, for receiving the springs

Images