US2298060A - Screen - Google Patents

Description

c. I. LATTIG Oct. 6, .1942.

SCREEN Filed Aug. 50, 1939 3 Sheets-Sheet 1 f/wE/v 70/? CHARLES I. LATTIG,

Oct. 6, 1942.

c. LATTIG SCREEN Filed Aug. :50) 1939 3 Sheets-Sheet 2 [YVE/YTOR CHAREES I. LATTlG,

0a 6,- 1942. c. I. LATTIG 2,298,,060

SCREEN Filed Aug. 30, 1939 3 Sheets-Sheet 3 40 7 .Z/WE/WOR:

1? 7 CHARLES I. LATTIG,

Patented Oct. 6, 1942 UNi-TE- STATES r or ies SCREEN Charles I. Lattig, Columbus, Ohio, assignor to The Jeffrey Manufacturing Company, a corporation of Ohio 10 Claims.

This invention relates to a screen or Other vibratory mechanism and an object of, the invention:isi to provide an: improved structure of the above: class including animproved type of suspension means for the deck frame.

Another object of the invention is to provide an apparatus of the above type in which improved rectilinear, vibration imparting means is provided for the screen deck frame, either alone or in combination with improved suspension means for-said. deck frame.

Still another, object. of the invention is to provide a screening apparatus with rugged reversely positionable discharge-mechanism for the screen material which may be, selectively discharged from opposite sides thereof.

Other objects ofthe. invention will appear hereinafter, the: novel features; and; combinations being set forth in the appended claims.

In the accompanying, drawings,

Fig. 1 is; a side elevational view of a screencomprising my invention;

Fig. 2 is a plan view of. the screen of Fig. 1:

Fig. 3- is a side elevational viewof the. screen showing the opposite side'than thatof Fig. l and showing the discharge pan removed;

Fig. 4. is a sectionalview showing particularly the detailedconstruction of the; discharge pan and taken on the line 4-4; of. Fig. 2- looking, in the direction of the. arrows;

Fig. 5 is an enlarged. sectional elevational view of the reciprocating mechanism taken on the line 55 of Fig. 2 looking in the direction of the arrows.

Fig. 6 is an enlarged detailed view with parts shown in section, showing one of the suspension devices and takenon the line 66- of Fig. 2 looking in the direction of the arrows;

Fig. 7 is'a transverse sectional view of the deck taken on the line; of Fig. 1 looking in the direction of the arrows; and

Fig. 8 is a transverse sectional view' taken on the line 8'8.of Fig. 5 looking in the direction of the arrows.

Referring. to the accompanying drawings, it will be seen that the screen comprising my invention has a main frame I'll formed. by a pair of spaced side plates H, I 1, preferably provided at their edges with reinforcing integral flanges which are preferably widened at the bottoms of the side plates H to form runners or supporting plates I2.

Extending between and, rigidly attached at their opposite ends to the side plates l I, H, as

by welding, is a plurality'of pipes l3, I4, I 5 and I6.

Also extending between and welded to saidside plates H, H along the lateral edges thereof is a plate I'i which acts as a sluiceway to support the liquid and screened material as hereinafter described more completely. The upper end of the plate I! is bent to form a transverse support for a feed chute H! by which material is fed to be screened, a typical example of which is the mud used' in the drilling of oil wells, the function of the screen being to remove the shale from the mud, which is. of course in a very liquid state, to permit reuse of the mud in the drilling operation.

The feed chute I8 includes a top cross-angle !-9 which cooperates-with the bottom of the chute to support a plurality of guide vanes 26 which are pivotally adjustable about upright bolts 2|. The guide vanes 20 may be adjusted to direct the flow of incoming mud to various parts of the screen to obtain the desired uniformity of distribution thereof over the screen surface.

To control the fiow of the-'mud further and to discharge it onto the screen surface, the feed chute i8. is also provided with a. pivoted dam plate 22 which is pivotally attached adjacent its top by bolts 23 to thetop. of the feed chute As clearly illustrated in Fig. 2 of the drawings, an elongated orifice 24 is provided at the bottom of the dam plate 22. and thedischarge edge of the feed chute [8 to permit the mud toflow downwardly onto the screen. The sizeof this orifice 2.4 is automatically adjustable in response to the fluid flow over the feed chute l8 by the freely swinging action of the dam plate 22 provided by the pivot bolts 23.

Suspended from the main frame 10 by suspension means hereinafter described in complete detail is a deck 25. The deck 25 comprises a frame having longitudinally extending side membars 26 which at spaced intervals are interconnected by a plurality of transversely extending bars 21 (see Fig. '7) which are preferably upwardly bowed toward the center of the deck 25 and are provided with integral upwardly extending arms 28, which arms 28 terminate in integral inwardly extending fingers 29. As clearly seen by reference to Fig. 7 of the drawings, the side members 26 are rigidly attached to the upstanding arms 28 of the bars 21, preferably by welding.

Extending upwardly at an angle from each of the side members 26 is a pair of plates 30 and 3|, the bottoms of which plates are preferably welded to the top edge of said side members 26.

Extending transversely across the deck and forming a part of the frame thereof is a pair of pipes 32 and 33, the opposite ends of which are rigidly attached, as by welding, to pairs of said plates and 3 I, respectively.

Extending between the two pipes 32 and 33 and rigidly attached to them, as by welding, is a Z shaped supporting plate 34 to which is attached a reciprocating mechanism 35 hereinafter described in complete detail.

Also extending upwardly at an angle from each side member 26 is a pair of plates 36 and 31 between which, and extending transversely across the deck 25 and forming a part thereof, are angle members 38 and 39 (see Fig. 1) which are preferably welded to said plates 36 and 31 respectively. As hereinafter described in complete detail, the plates 36 and 31 and the angle members 38 and 39 cooperate with flexible suspension means to suspend the deck 25 from the main frame H] for vibration with respect thereto under the control of the reciprocating mechanism 35.

Extending longitudinally of and forming a part of the frame of the deck 25 is a plurality of laterally spaced rods 40 which are welded to the cross bars 21.

The rods 40 are provided with soft rubber strips 4| forming bearing caps over which is stretched a screen cloth 42 which is stretched laterally across the deck frame by stretching mechanisms 43 at opposite ends thereof which are pivotally attached to transversely extending rods 44 welded to the bottoms of the fingers 29 of said deck frame.

While I have illustrated the deck as formed with the screen cloth 42, it is to be understood that my invention is not necessarily so limited,

but the deck 25 may have a perforated bottom plate or it may have an imperforate bottom plate, in which case the mechanism, instead of being a screen, would be used as a conveyor or feeder;

and it is to be particularly understood that the suspension mechanism and the reciprocating mechanism, either of them alone or in combination, may be employed with any such deck construction as above suggested.

Attention is now directed particularly to the suspension means for the deck 25 by which it is suspended for vibration with respect to the main frame l0, which forms one important feature of my invention.

Referring particularly to Fig. 6 of the drawings, it will be noted that attached to the pipe |3 at a position between the side of the deck 25 and a side plate ll of the main frame It] is a tensioned hanger strap 45 which is preferably in the form of a flat belt of woven fabric material, such as fabric reinforced rubber belting or fabricated brake-lining material. The strap 45 has one end wrapped about the pipe |3 as aforementioned, and the free end is rigidly attached to the strap, preferably by sewing and riveting though any other desired attaching method or means may be employed. The strap 45 then extends from the pipe |3 to the pipe |4 about which it is wrapped and from which it extends to tensioning means 46, preferably in the form of a turn-buckle to which it is attached by a bifurcated yoke 41 (see Fig. 2), which yoke carries a cylinder 48 about which the strap 45 is Wrapped and rigidly attached in the manner above described in connection with its attachment to the pipe I3.

By reference to Figs. 1, 2 and 3 of the drawings, it will be seen that there is another strap 49 somewhat similarly associated with the pipes l5 and I6 adjacent the front end of the screen, and when one end of the strap 49 is attached to a yoke 50 similar to the yoke 41 which is also associated with the tensioning means 46, it is obvious that by adjusting the turn-buckle or tensioning means 46 the two straps 45 and 49 on one side of the screen may be simultaneously tensioned, It is of course evident that the suspen-- sion and tensioning means .above described are duplicated on each side of the screen and the two sides are independently adjustable.

To suspend the deck 25 from the four straps 45, 49 the aforedescribed angle members 38 and 39 which form part of the deck frame are attached to said straps intermediate their points of attachment or bearing points with respect to the main frame ID; that is, angle member 38 is attached to the straps 45 at the rear end of the device intermediate the points where said straps 45 are attached to or bear on the pipes I3 and I4, and each such attachment is effected by a clamp plate 5| which is bolted or otherwise removably attached on opposite sides of the straps 45 to the angle member 38.

Similar means is provided to attach the two forward straps 49 to the angle member 39. It is of course evident that the angle members 38 and 39 extend laterally beyond the side members 26 of deck 25 to provide for their attachment to the straps 45 and 49. However, they terminate short of the side plates ll of frame l0 so as not to interfere with the free vibration of the deck 25.

Attention is now directed particularly to Figs. 2, 5 and 8 of the drawings and to the reciprocating mechanism 35 which imparts the vibratory or reciprocatory motion to the deck 25. Extending transversely between the side plates H of the main frame l0 and rigidly attached thereto, as by welding, is an inverted channel plate 52 upon which is supported an electric driving motor 53.

Also mounted on the plate 52 and rigidly attached thereto is a bearing housing 54 through which extends a shaft 55 mounted on roller bearings 56, 56 which provide for free rotation of the shaft 55 but restrict it against axial movement with respect to the housing 54.

Removable adjusting and lock nuts 51 are threaded on the shaft 55 to detachably connect it to the inner recesses of the bearings 56, 56. The shaft 55 extends through grease seal forming openings in end plates 58 and 59 of the housing 54. At its upper end the shaft 55 has keyed thereto a drive pulley 60 which is driven from a pulley on the motor 53 by a belt 6|. At its lower end the shaft 55 carries a wabble plate 62 which is keyed thereto and is removably held thereon by a keyed nut 63. The wabble plate 62 is provided with opposite bearing trackways which run between a pair of rollers 64 and 65, the former of which is mounted on the shaft 66 carried by a bracket which is rigidly attached to a housing 61, which housing 61 is in turn rigidly attached to the aforedescribed supporting plate 34 formed rigid with the deck 25. The roller is mounted on a shaft 68' which is carried by a bracket formed by two plates 69 and 10 which extend between two plates 1| forming an arm (see Fig. 8) of a 'bell crank lever, which plates 1| are rigidly attached to a pivot pipe 12, as by welding, which pipe 12 is pivoted on a bolt 13 extending between upright side plates 14, 14 of the housing 61.

The plates Tl also extend forward toform the other arm of the bell crank lever and at their free ends are connected by a cross-angle 15.

Also extending between the arms H, H and adjacent and attached to the plates 69 and T is a bearing plate [6 provided with a boss H which receives a rather strong coil spring 18 adapted to be adjusted as to its compression action by an adjusting screw 19 which threads through a nut Bli-rigidl'y attached to the plate 34, as by welding, and with which screw T9 is associated a lock nut 8!.

It is evident that the spring 18 will urge the rollers 64 and 65 against the wabble plate. 62. To insure that the rollers 64 and 55 will always be in contact with the wabble plate 62 is. the

function of the coil spring 18. However, to prevent an undue amount of friction between them, an adjustable stop is provided by a set screw 82 which cooperates with the aforedescribed crossangle '15 on the other leg of the bell crank lever and that which carries the roller 55. In adjusting the mechanism, the set screw 32 is released so that the two rollers 55'and 54 bear strongly against the wabble plate 52. Thereafter, set screw 82 is adjusted to move roller-65 away from the wabble plate 62 and against the action of spring 18 until the wabble plate 62 rolls freely between the rollers 64 and 65 without undue friction.

In addition to the structure above described, it may be pointed out that the housing 6'! is provided with a removable cover plate 83 which provides access to the interior thereof for purposes of lubrication, inspection and repair. Furthermore, at its front end the housing is provided with a sleeve 84 through which the shaft 55' extends and a flexible bellows 85 inter-connects the sleeve 84 and the aforementioned end plate 59 of the stationary bearing housing 54, thus providing for free reciprocation of the housing 6? with respect to the housing 54 while preventing a loss of lubrication from either and preventing any access to either housing, thereby keeping dust and water out of both of them.

It is evident from the above description of the reciprocating mechanism that the-motor 53 will drive the shaft 55 to rotate it which produces rotation of the wabble plate 62. Rotation of the wabble plate 62 will cause the housing 61 to rei.

ciprocate in a rectilinear motion because as the wabble plate 52 rotates, it will cause the two rollers 64 and 65 to' move rectilineally along the axis of the shaft 55, which motion is of course imparted to the housing 61, thence to the plate 34 and to the deck by way of pipes 32, 33 and plates 35, 5|.

It has been found in practice that a rectilinear motion is very important for this type of screen, particularly as it is very efficient to screen material and at the same time effects a conveying action independent of the action of gravity. This is particularly useful also where an imperforate deck is provided due to the conveying action on the material. Furthermore, in order to prevent destruction of the parts and to provide for a high efiiciency of operation, it is to be noted that the rectilinear motion imparted to the deck 25 by the reciprocating mechanism is along an axis which is at right angles to the longitudinal axes of the suspension straps and 49. operation the straps 45 and 49 are merely defiected at right angles to their longitudinal axes and a true or substantial right angle or perpendicular relation of this character is extremely Consequently, in

important; otherwise, a considerable amount of energywill be dissipated in stretching the straps 45 and 49 which would do no useful work, therefore decreasing the efiiciency of the screen while at the same time greatly reducing the lives of the straps 45, 49. I

Attention is now directed particularly to Figs. 1, 2, 3 and 4 and to another feature of my invention which provides for the discharge of the screened material to either side of the screen as desired. 1

Extending transversely between the side plates H and rigidly attached thereto is a front angle member 35 and a rear angle member 81. The angle members and 87 form supports for a transversely slidable pan 83 which has bent over flanges 89 and 90 formed on the side walls thereof adapted to ride on the upper edges of the angle members 86 and 81, respectively, and be slidably supported thereby.

The pan 88 is provided with a closure or door 9! at one end (see Fig. 1) and a discharge spout 92 at the other end which is open to permit free discharge of liquid from said pan '88. The pan bottom is also'provided with a reinforcing rib 93.

Each of the side plates H is provided with an opening 94 so that the pan 88 may readily slide therethrough from either side of the complete device; that is, the pan may be reversed so that the discharge spout 92 is either on the right hand side or onthe left-hand side.

It is furthermore to be noted that the plate H which receives material passing through the upper part of the screen cloth 42 is provided at its lower end with a downwardly extending flange 95 which extends down into the pan 88 thereby insuring a discharge of all of the material on said plate I? into the pan 88 without any spillage. It may additionally be noted that the front angle member 85 has a further functionin that it acts as a discharge chute for the material which passes over the forward end of the screen cloth 42 or bottom of the deck 25.

In the operation of the device, material to be screened, such as freely flowing mud used in the drilling of wells, is fed to the feed chute l8 by which it is fed under the regulation of the guide vanes 25 and dam plate 22 to the vibrating deck 25 which is supported by the suspension means, including the tensioned hanger straps 45, 49. The deck 25 is reciprocated with a rectilinear motion along an axis which is substantially at right angles to the axes of the hanger straps 45 and 49; The liquid and smaller particles of material or the usable mud pass through the screen cloth 25 and are received either on the plate I! or directly into the pan 88. That material which is received. on the plate I! flows down it and into the pan 88 from which the material is discharged laterally to the right or to the left, depending upon the positioning of the pan 88, to any desired receptacle or tank.

The above mentioned reciprocatory motion is effective to convey the material, such as shale, which will not pass through the screen cloth 42 and to discharge it over the front end of the deck 25. This conveying action is of course a positive conveying action due to the fact that the deck 25 has a rectilinear motion with components which are both vertical and horizontal which are eifective to convey the material positively when on the screen cloth 42. Furthermore, due to the sloping of the deck 25, this conveying action is aided by gravity. This downward sloping of the screen is not essential, for

the conveying action will take place even if the screen 42 is horizontal or slightly inclined upwardly.

As was above set forth, the reciprocating mechanism and the suspension mechanism for the deck 25 are both useful individually and in combination in other vibratory apparatus than screens, for example, in vibratory conveyors or feeders in which instance the deck bottom is usually but not necessarily imperforate.

Obviously those skilled in the art may make various changes in the details and arrangements of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and I therefore wish not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:

1. In a screen, the combination with a frame, of a screening deck, means for vibrating said screening deck with a rectilinear motion, flexible tensioned fabric strap means supporting said deck for vibration, said strap means being tensioned along axes substantially at right angles to the axis of said rectilinear motion, and means for tensioning said fabric strap means independently of the weight of said deck.

2. In a screen, the combination with a frame, of a screening deck, means for vibrating said screening deck with a rectilinear motion, flexible tensioned fabric strap means supporting said deck for vibration, and means for tensioning said strap means independently of the weight of said deck.

3. In apparatus of the class described, the combination with a main frame, of a deck frame, means for vibrating said deck frame with respect to said main frame, means for supporting said deck frame from said main frame comprising tensioned flexible fabric hangers on opposite sides of said deck frame, and means for tensioning said fabric hangers independently of the weight of said deck.

4. In apparatus of the class described, the combination with a main frame, of a deck frame, means for vibrating said deck frame with respect to said main frame, means for supporting said deck frame from said main frame comprising tensioned flexible fabric hangers each having two bearing points on one of said frames and one bearing and attaching point on the other, and means for tensioning each of said hangers between said two bearing points on said one frame independently of its attachment to the other.

5. In apparatus of the class described, the combination with a main frame, of a deck frame, means for vibrating said deck frame relative to said main frame, and means supporting said deck frame from said main frame comprising tensioned hanger straps and tensioning means connected to two of said hanger straps, said tensioning means being constructed and arranged to tension said hanger straps independently of the presence or absence of said deck frame.

6. Apparatus of the class described comprising a main frame, a deck frame, suspension means including tensioned fabric means attached at opposite ends to said main frame, and intermediate its ends to said deck frame, and means for tensioning said suspension means independently of the weight of said deck frame.

'7. Apparatus of the class described comprising a main frame, a deck frame, suspension means including tensioned fabric means attached at opposite ends to one of said frames and intermediate its ends to said other frame, and means for tensioning said suspension means independently of its attachment to said other frame.

8. In apparatus of the class described, the combination with a main frame, of a deck frame, flexible suspension mechanism for said deck frame comprising flexible elongated members spaced along one side of said frames, means attaching one end of each flexible member to the main frame, bearing and supporting means for each flexible member also on said main frame, tensioning means interconnecting the free ends of said flexible members, and means attaching the deck frame to each flexible member intermediate its points of bearing on said main frame.

9. In apparatus of the class described, the combination with a main frame, of a deck frame, means for vibrating said deck frame relative to said main frame, means for supporting said deck frame from said main frame for vibration along a substantially rectilinear axis comprising at least two longitudinally spaced tensionable hanger means each having an axis substantially at right angles to said rectilinear axis and spaced laterally of said deck frame, and means for tensioning each of said hanger means independently of the weight of said deck frame.

10. In apparatus of the class described, the combination with a frame, of a screen on said frame, means below said screen for catching material passing therethrough including a pan having side walls extending from one side of said screen to the other side thereof, said pan having one permanent end closure with the other end open to discharge material laterally of said frame, means including supports on said frame for supporting said pan for sliding movement with the end closure thereof alternately on opposite sides of said frame, said frame having similar openings on opposite sides thereof to receive the pan in reverse positions.

CHARLES I. LATTIG.

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