US2238711A - Screening apparatus - Google Patents

Description

April 15, 1941. SO'LDAN SCREENING AFPARATUS Original Filed Oct. 18, 1934 2 Sheets-Sheet 2 fwezz WW NW IQ a Patented Apr. 15, 1941 SCREENING APPARATUS Lewis E. Soldan, Chicago, Ill.

Application 6Ciaims.

The present invention has to do with screening apparatus, and is particularly concerned with an improved screen of the type in which rotating eccentrics are employed to obtain a vibrating action.

One of the objects of the invention is to provide a screen of the type described in which all the moving parts of the vibrating mechanism are completely enclosed and operate in oil.

Another object is to provide in such a screen a floating shaft for. rotating the vibrating mechanism.

Still another object is to provide improved means, in the form of hinged torque arms, with rubber disk supports at the ends of the arms, for holding the frame of the screen at the desired angle without interfering .in any way with its intended movement.

While the foregoing statements are indicative in a general way of the nature of the invention, other objects and advantages will be apparent to those skilled in the art upon a full understanding of the construction, arrangement and operation of the new screen.- a

One embodiment of the invention is presented herein for the purpose of exemplification, but it will of course be appreciated that the invention is capable of being embodied in other structurally modified forms coming equally within the scope of the appended claims.

In the accompanying drawings:

Fig. 1 is a side view of the screen;

Fig. 2 is an end view of the same;

Fig. 3 is a vertical diametric section through one end of the vibrating mechanism;

Fig. 4 is a section, taken on the line 4-4 of Fig. 3; and

Fig. 5 is a vertical diametric section through one of the supporting disks, taken on the line 5-5 of Fig. l.

As will be observed in the drawings, the ap paratus includes a rectangular frame H1 in which a wire screening cloth II is secured. The side plates |2 of the frame are attached by bolts |3 to flanged sleeves It on the outer sides of the plates,

, and the sleeves H are telescoped over the opposite ends of a tube l5 which" extends through the plates l2 from one side of the frame to the other.

The mechanism which is employed to vibrate the frame is located partly at one side of the frame and partly at the other, but as it is the same at both sides, only one side has been illustrated in Fig. 3.

The frame I0 is supported in an inclined position on two pedestals it which are located in spaced parallel relation to each other at opposite sides of the frame. The power used in vibrating the frame is transmitted through a shaft |1,v

which shaft is positioned within the tube It in spaced relation to the inner side walls of the lat- October is. 1934. Serial No. 748,174 Renewed June 24, 1939 ter and is provided at one end with a driving pulley 8 over which a belt (not shown) is adapted to be trained.

The shaft I1 is connected adjacent itsends to two drums I! which are journaled in bearings 20 in two casings 2|. The portions 22 of the casings in which the drums are Journaled are circular 'and rest in arcuate seats 23 in the pedestals I6,

where they are clamped against circumferential movement by complementary caps 24 on the pedestals. The caps 24 are held in position by bolts 25. By loosening the bolts 25 the casings 2| can be adjusted circumferentially.

The drums l9 are provided with radial flanges 26 to which correspondingly shaped rings 21 are secured by bolts 28. The rings 21 are provided about their inner peripheries with tubular projections 29, which projections are exteriorly circular in shape and telescope into circular seats 30 provided in the drums I9 at the bases of the flanges 26. The seats 30 are eccentric with respect to the bearings 20 in which the shaft I1 is journaled. The projections 29 are interiorly as well as exteriorly circular, but the inner surfaces 3| thereof are eccentric with respect to the outer surfaces and form seats for the reception of the outer races of bearings 32 in which the ends of the previously described tube l5 are journaled.

From this construction it will be understood that rotation of the shaft l1 will cause the tube l5 of the screening frame to gyrate about the shaft, and that the extent of gyration produced by the compound eccentrics will depend upon the particular position in which the rings 21 are bolted to the flanges 26'. The flanges 26 and rings 21 are provided respectively with counterbalancing weights 33 and 3|, which weights are arranged diametrically opposite the offsets represented by the eccentrics.

The casings 2| completely enclose the flanges 26 of the drums and the rings 21 and are connected with the side plates l2 of the frame by tubular diaphragms 35 of some suitable flexible oil-proof material. The casings 2| are intended to be partially filled with oil. The casings are provided in their upper portions with removable screw plugs 36 through which the casings canbe filled with oil, and are provided in their lower portions with removable screw plugs 31 for use in draining off the oil from time to time.

During the vibrating movement of the frame Ill the angle of the latter is maintained fixed with respect to the side pedestals I6 by means of tor- .power and insuring long life.

and confined between backing rings 42 and cover plates 43. Therings 42 and plates 43are held in position by bolts 44. Byremoving the bolts, the rubber disks 4i are rendered accessible. The disks 4| are apertured at their centers for the receptionof studs 45 which project laterally from the side plates [2 of the frame. The ends of "the hinged arms 38 are maintained in properly spaced relation to the side plates I! by collars 46 which fit on the studs 46 between the side plates I2 and the disks 4|. The disks 4| can be readily removed from the studs 45 after the cover plates 48 have been taken off by unscrewing nuts 41 which are threaded onto the ends of the studs.

-In order to change the eccentricity of the screening frame l0, it is merely necessary to remove cover plates 48 on the tops of the casings 2|, reach into the casings and unbolt'the rings 21 from the flanges 26, and then turn the rings relative to the flanges until the desired eccentricity is obtained, it being understood that the rings at both sides are intended to be turned in the same relative positions with respect to the flanges, suitable markings being provided on both members to permit this to be easily done.

The complete enclosure of the vibrating means within the side casings keeps all foreign matter out of the bearings and allows the moving parts to operate in oil, thereby greatly reducing the friction, preventing rapid wear, requiring less The hinged arrangement of the torque arms with respect to the casings improves the operation of the apparatus by eliminating all side strain between the supporting pedestals and the frame during the vibrating movement of the latter.

I claim:

1; In apparatus of the character described, a screening frame, a screen secured thereto, pedestals at the sides of the frame for supporting the screening frame, means associated with the pedestals for vibrating the frame, and means for maintaining the frame at a predetermined angle with respect to the pedestals, said means including torque arms which extend longitudinally of the frame in opposite directions from the vibrating means and are hinged to the vibrating means on pins the axes of which are substantially perpendicular to the plane of the screen.

2. A vibratory screen comprising a screening frame, pedestals on the opposite sides thereof, a driving shaft, oil tight casings supported by the pedestals, means within the oil tight casings independently of the driving shaft including two cooperating and adjustable eccentrics and counterbalancing weights for each to vibrate the screen frame, and torque arms pivotally secured to the oil tight casings and extending therefrom in a direction longitudinal of the screen frame, said torque arms being resiliently secured at the ends thereof to said screen frame.

3. A vibratory screen comprising a screening frame, pedestals on the opposite sides thereof, oil tight casings supported by each of said pedestals, a drum rotatably supported on said pedestal and within each of said oil tight casings, a driven shaft extending through the screening frame and secured to each of said drums, a tubular member secured to said screening frame and surrounding said driven shaft, a circular seat in each of said drums eccentric with respectto the driven shaft, an eccentric bearing seat member having the outer surface thereof fitting into each of said drum seats and an inner surface eccentric with respect to the outer surface, bearings between the inner surface of said eccentric bearing seat members and said tubular member, counterbalancing weights secured to said drums and torque arms pivotally secured to the oil tight casings and extending longitudinally of the frame in opposite directions and resiliently secured at the outer ends thereof to the screening frame.

4. Inc vibrating screen, a screen frame, means for vibrating the screen including a driving drum. an eccentric and counterbalancing weights, said driving drum being supported in a main bearing support, the main bearing support being provided with extensions forming a rigid housing around the driving drum, eccentric and counterbalancing weights, and a narrow strip of flexible oil resistant material connecting the screen frame with the rigid housing.

5. A high speed vibratory screen, comprising a screening frame, supports on opposite sides thereof, a driving member rotatably supported by each of said supports; said member having a hub portion journaled in the, supports and an enlarged central portion provided with an inner face eccentric with respect to the hub and provided with a flanged portion extending from the central portion, a flanged eccentric sleeve supported within the eccentric face of said member, adapted to be rotated therein to adjust the throw of the screen, and, having its flange in sliding engagement with the flange of said member, means to secure the flanges together, a counterbalancing weight permanently secured to the flange of the member and rotatable therewith, a separate counterbalancing weight permanently secured to the flange of the eccentric and rotatable therewith, and a tubular member extending across the frame and having each end joumaled within one of the eccentric flanged members, and a shaft connecting the oppositely disposed driving members.

6. In a high speed vibrating screen, a screen frame, supports on each side of'the screen, a rotatable driving drum comprising a hub portion journaled in said supports, a central portion having an eccentric inner face and a flange extending radially from the central portion, a driven eccentric having a flange substantially parallel and coextensive with the flange on the rotatable driving drum, said driven eccentric having an eccentric outer face adapted to slidably engage the inner face of the rotatable driving drum, means to adjustably secure said flanges together, a reciprocating member secured to the screen frame and rotatably supported within the driven eccentric, a counterbalancing weight permanently secured to the flange of the driving drum. a separate counterbalancing weight permanently secured to the flange of the driven eccentric, and a casing supported by the screen supports which substantially encloses the flanged members and counterbalancing weights, said casing provided with an opening adapted to give access to the means securing the flanges together to permit the relative rotation of the driven with respect to the driving eccentric.

LEWIS E. SOL-DAN.

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