US2309486A - Screening apparatus - Google Patents

Description

Jan. 26,' 1943.

D. A. WEBER" SCREENING V.Puxfm'r'us Fned May 15. 1939 y2 su@mia-sheety 1 -LIIIE-Iililiiww ,.9 i

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Jan. 26,1943. Y y D, A, WEBER 2,309,485

SCREENING APPARATUS Filed may 15,V 1959 2 sheets-snaai 2 lull UsgAV//A Patented Jan. 26, 1943 j UNiTl-:D STATES J PATENT" OFFICE Don A. Weber, Fort Wayne, Incl., assignor to TheV Deister Concentrator Company, Fort Wayne, Ind., a corporation of Indiana Application ltay` 15, 1939, Serial No. 273,712 3 Claims. (Cl. 209-365) This invention pertains to screening appataken about on line 4-4 of Figure 2. Figure 5 ratus, more partie arly of the type in which is an enlarged detail of Figure 1 and Figure 6 the line grains to pass through the screen and the invention in the accompanying drawings the coarser grains to move therealong. a screen frame I is mounted at any suitable A usual construction of such screening appaangle in a support 2. Any suitable adjusting deratus involves aframe in which the screen fabric vice 3 may be provided to adjust the angle is tensioned so as to hold it taut in the desired at which the frame I is set. A screen cloth position. In this type of apparatus vibrating or fabric 4 is stretched Within the frame I mechanism is often mounted upon fa bridge by means of any suitable tensioning devices 5. which spans the above mentioned frame, and The screen fabric 4 may be of any type suitsary to vibrate the screen, and that accordingly 6 is a vibrating mechanism of any suitable type provide a bridge structure which will be extor E. Flanagan. From this mechanism a contremely rigid so that the vibratory movement nection shown in the drawings as la rod or stem have een used for mounting the vibrating the vibratory movement from the mechanism mechanism, which are usually of cast iron, are 1 to the screen fabric. In the structure illusoften subject to shocks during shipment of the trated in the drawing the connection to the apparatus, and that castings are broken. screen fabric 4 is made through a frame o1 Another object of this invention, therefore, panel 9. The structure of this panel and its is to provide an improved bridge structure which ,35 operation in connection with the screen fabric will not only have improved rigidity, but which is described in detail in the co-pending appli- Another object is to provide a bridge structure The vibrating mechanism may be driven by in which the structure of the housing or support Vx any suitable driving means such las a motor I0.

additionally support and brace the bridge strucother device adapted for driving the same from ure. ,45 some external source of power. Further objects will appear from the follow- The structure of the bridge 6 comprises a pair ing descript1on, taken in connection with the of side members II extending substantially paraccompanying drawings, in which Figure l is allel to each other and so as to span the frame of the bridge. Figure 3 is a horizontal section be secured together by any suitable means as, somewhat enlarged of the middle portion of the for instance, by welding. In the structure illusbridge structure takenjustbelow theremovable trated they are additionally reinforced by angle cover. Figure 4 is a similarly enlarged section A55 members I3 extending preferably the full length of the bridge 6 between the sides of the frame I. This provides for the bottom of the bridge a channel or boxed structure forming a stiff and rigid bridge, both vertically and laterally. The ends of this boxed structure may be stiffened by transverse angles I4 extending between the side members I I and secured thereto and to the members I2 and I3 in any suitable manner as, for instance, by welding. All these parts of the bridge are preferably constructed of wrought metal, such as steel plate and angles. The middle portions of the members II extend upwardly from the ends so as to have a considerable height at the middle portion. This, of course, renders these side members very stiff in the vertical di rection.

The vibrating mechanism 1 may be supported and housed in an inner housing I5 of appropriate form to lenclose the mechanism. A suitable form for this housing is described in the above mentioned Patent No. 1,112,817. This housing may be iilled with oil so as to lubricate` the vibrating mechanism.

In accordance with this invention the housing I5 is provided .with extended end members I6 forming a part of the housing I5 and extending across the space rThe housing I5 is preferably mounted in the middle portion of the bridge 6 so as to be supported by the bridge, and the end members I6 are provided with lugs I1 to accommodate fastening means for securing theseend members to the side members II. Such fastening means may be bolts I8 or other suitable devices. This arrangement secures the upper portions of the side members II rigidly together, the members I5 of the inner housing serving to'brace the members II rigidly so that the entire bridge forms a rigid truss or braced structure. It will be housing I5, which is usually a casting of cast iron or other suitable material, is enclosedbetween the side members II so as to be protected thereby against injury from the outside.

In order to provide for access to the housing I5 and the vibrating mechanism contained therein, one of the members II is provided with an opening I9 which may be closed by a movable cover 2B of suitable design. In the embodiment illusis formed of a sheet metal plate of the same gauge as that of the side members II bent to form to provide a top plate 2I and a rear plate .22. The top plate 2l may have secured thereto as by welding a pair of pins 23 so located as to enter drilled holes 24 in the rear side member II. When the pins 23 are inserted in the holes 24 the cover may be lowered so as to fit the front plate 22 into the opening I9. This completes an outer enclosure formed by the cover 26, the side members I I and the end members I6 within which the inner housing I5 is en closed. The front plate 22 may be provided with a lug or plate 25 having a slot 26 adapted to receive a clamping bolt 21 swiveled at 28 in the front plate 22 and provided with a hand nut .29 which may be screwed'down upon the lug 25 .to secure the cover 2D in place.

In order to provide for the passage therestem 8, an opening 3B is formed of the housing I5 and also the floor plate I2. In order to render the outer enclosure formed by the plates II, and the end members I6 dust proof, a suitable fitting 3I may be placed opening 3i) and a flexible sheet of rubber or other suitable material noted that the `32 may be placed vover said fitting-and secured .by '76 a suitable clamping ring 33. The plate or disc 32 may have a close fit upon the stem 8 so as to prevent the passage of dust therealong, and its flexibility permits it to vibrate with said stem, while at the same time maintaining a dust proof closure.

It will be seen, therefore, that this invention provides an improved structure for this type of bridge. The arrangement of the trussed struc ture of the bridge itself is such as to provide a very sti and rigid support for the vibrating mechanism. The lower channel structure is surmounted by the upwardly extending side members II which, on account of their height at the middle, have lthe stiffening eifect of a high upper These plates are rigidly side braced by the members I6 extending between them. This prevents any side sway or any tendency for the truss structure to twist. In the vertical direction the bridge is particularly stii and, therefore, advantageous support for a vibrating mechanism of the type mentioned as a characteristic of the operation of such mechanism is that it must impart very sudden movements to the screen fabric in order to provide a throwing action tending to throw the particles of material upwardly from the screen so as to facilitate their movement therealong. With such mechanism the extra rigid bridge structure is effective in imparting such movement accurately without any give or yielding when the sharp increase in force must be transmitted.

It will be noted also that the structure provides a double enclosure for the vibrating mechanism. Theinner enclosure I5 houses the mechanism itself and provides for immersion thereof in oil. The outer housing provides not only mechanical protection to the inner housing, but also addi- -tional dust proofing. The greater portion of the dust is excluded by the outer housing so as to prevent the collection of dust on the inner housing which usually promotes the gradual entrance of dust particles into the housing through cracks around the openings for the levers.

While the invention has been described as embodying a unitary structure, it will be understood, of course, that individual features or subcombinations thereof may be useful by themselves without reference to other features or the complete combination, and it is understood that the employment of such individual features or subcombinations is contemplated by this invention as Within the scope of the appended claims.

It is further obvious that various changes in the details of construction within the scope of the appended claims may be made without departing Yfrom the spirit of this invention, and that accordingly the invention is not limited to the specific details shown 4or described.

Having thus described the invention what is claimed is:

1. Drive mechanism for screening apparatus of the character described having a screen supported on a stationary frame for vibratory movement, comprising, a built-up structure spanning the stationary frame, said structure including a pair of upright sheet-metal side plates, a horizontally-extending sheet-metal floor plate extending between and spacing said side plates, means rigidly connecting said side and floor plates, stiffened end braces extending between and secured to said side plates and to said floor plate, -a pair .of upright cross webs yextending 'bef ported on a statlonary frame for vi-bratory movement, comprising, a built-up structure spanning the stationary frame, said structure including va pair of upright sheet-metal side plates, a horizontally-extending sheet-metal iloor plate eX- CII DON A. l/VEBER.

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