US2374775A

US2374775A - Screen

Info

Publication number: US2374775A
Application number: US390309A
Authority: US
Inventors: Walter J Parks
Original assignee: Tyler Co W S
Current assignee: WS Tyler Inc
Priority date: 1941-04-25
Filing date: 1941-04-25
Publication date: 1945-05-01
Anticipated expiration: 1962-05-01

Description

May l,v 1945.

-W. J. PARKS SCREEN Filed April 25, 1941 4 Sheets-Sheet 1 A ATTO/wim W. J. PARKS May 1, 1945.

S CREEN 4 Sheets-'Sheet 2 Filed Aprilv 25, 1941 'INVNTOR Walcr J.' Par/f5 ATTORNEYS.

w1 J. PARKS l May l, 1945.

SCREEN Filed April 25, 1941 4 Sheets-Sheet 3 NGE mm, E

INV EN TOR.

May 1, 1945. W, J, PARKS 2,374,775

SCREEN Filed April 25, 1941 4 sheets-sheet 4 M INVENTOR.'

lA/alfer I Par/f5 .ciency.

- taken on the line -5 of Rig.. 4;

Patented May 1, 1945 Walter J. Parks, Cleveland Heights, Ohio, assignor to The W. S. Tyler Company Application April 25, 1941, Serial No. 390,309

5 Claims.

This invention relates, as indicated, to screens, but has reference more particularly to a deck or screen ,surface construction for screens, s

In the prior art, a deck construction is `disclosed in which a plurality of individually-removable parallel 'rods are supported in a flexed condition s longitudinally of the'screen body. This construction has several disadvantages, among which may be mentioned the following (l) the assembly and removal of the rodsk requires a considerable amount of time and labor (2) the rods, in being assembled and removed, are flexed beyond their point of ultimate setting, and (3) the arrangement of the rods longitudinally of the screen, that is to say, in the direction of 'movement of the screened material, creates a possibility of Wedgeshaped particles lodging between the rods, thereby spreading the rods to the extent of permitting oversize material to pass.

It is a primary object of the present invention to provide a deck construction for screens, which not only overcomes all of the aforesaid disadvantages, but Vwhich has vcertain other inherentadvantages resulting in improved screening ei- Other objects and advantages of the invention will be apparent during the course of the following description. y

In the accompanying drawings, Aforming a partL v of this specification, and in which .like vnumerals are employed to designate like parts throughout the same, y .Y

Fig. `1 gis a fragmentary plan view` of one form A of screen deck embodying the invention;

Fig. 2 is a transverse cross-sectional view, taken on the line 2-2 ofFig. 1;;

Fig. 3 is a fragmentary cross-sectional View taken on the line 3--3 of Fig. 1; Y

Fig.. 4 is a View similarL to Fig. 2, `lout showing an alternative form of deck construction;

Fig. 5 is a fragmentary cross-sectional view Fig. Bis a fragmentary view showing the manner in which the clamping members of that form of the invention shown in Fig. 4 are mounted on the screen;

A Fig.,7 is a view similar to 1, `butshowing a modied form of deck construction;

Fig. 8 is a cross-sectional view, taken on the line 8 8 -of Fig. 7; i

Fig. 9 is a fragmentary cross-sectional view, taken on the line 9 9 of Figs. 7 and 1-0;

Fig. 10 is a view similar to Fig. `8,.'but` showing i8, which -function in a A:strip Il of rubber or the like. y cross-members `5 atoppositesides ofthe stem'of the T 6 are angles I2, which coact kwith the- Fig. l1 is a fragmentary cross-sectional view,

taken on the line ll--I l of Fig. 10.

Referring more. particularlyto that form .ofthe invention shownin Figs. 1, '.2 .and `3, the screen comprises spaced side kplates I .and 2 between which the screen proper is disposed. -The screen support comprises a panel `or frame which is welded or otherwise secured to the side plates and consists of sides in the form of structural angles 3, having legs 4 providing ledges disposed l in a `common plane, and cross-members 5 also in the form of structural angles.

Welded or otherwise secured to the cross-members 5 of the frame, and` extending longitudinally along the center of the screen in ,a l 5,. ,the flange 'I of which is disposed'in a plane considerably higher than that of the ledges 4. The flange I has secured to its upper surface, ,as ,by means of bolts 8, and nuts 9, a metal strip..y I0 to the uppersurface of whichy is vulcanized a protective `Secured to' the flange 'l of the T to form pocketsor recesses for the yreception of the rod spacing stripsto be presently described. v

Welded or otherwisesecured to the cross-members 15 at points intermediate the-T 6v andthe angles .3 are metallic supports I3 to the-upper edges .of-which are welded `rails I4, the 4upper surfaces of which are disposed in afplane above that 4of the ledges 4 but somewhat below that of i the ange 'l of the T 6. A

Secured to the side plates l. and 2 at points oppOsite 'the angles 3 are clamp retainingmembers I5 which have loosely secured thereto, as by means of bolts I6 and nuts Il, clamping members manner to be presently described. v f

-The screen proper comprises a series of rod sections .0r units, each of `which consists of a plurality of parallel metallic rods I9, a pair of spaced blocks 2n of 4rubber .or `the like having spaced openings into which the .ends of the rods 19 extend, anda block 2| of rubber or the like through Iwhich the central portionoi each rod extends. The blocks 20 have metallic wear strips ,22 vulcanized' to their upper surfaces, While the blocks 2l have metallicwear strips 23 vulcanized to their lower surfaces. .I f 1 In assembling the rod ,sections or units to form the screen, the clamping members I8,.wl 1ich, it

a still further modiiication of the invention, and

will be noted, are in sections of substantially'the same length as the .rodA units, are Yiirst loosened so as to permit their movement to a posit-,ion` such plates I and 2 by means of screw-bolts 25 and,y

nuts 26. Movement of the clamping members i8 to the aforesaid position results in the rods IS' of the units being cambered to the condition shown in solid lines in Fig. 2. In this condition ofthe rod units, the inner ends of the units exert an upward pressure on the flange 'I of the T `6, the outer ends of the units exert an upward pressure on the clamping members I8 and the central portions of the units exert a downward pressure on the rails I4. This pressure .is suicient to retain the units in position under virtually all conditions of operation of theV screen, it being'understood that the screen body is to be electrically or mechanically vibrated in. accordance with well-known practices in the screening art. i

In order, however, to eliminate any possibility of the units being moved to any appreciable extent laterally during the operation of the screen, metallic retainer bars 21 are secured to the angles 3 to limit such movement of the units.

The resiliently mounted unitary structure of the rod elements, together with the transversef This is quite important as it has been found in practice that anyclearance between the rod and holding .element allows rthe rod tovbrate and causes Wear at the junction of the holding strip'v 'and' the rod. If the vholding strip is of metallic material a disturbing noise would also be present. The firm clamping of the rod in tne rubber also prevents the material being'screened from working into the joints, and if abrasive, as is usually the case, causing premature failure of the-screen section. f Y

(b) The rubber spacing strips are on some parts of the deck, protected from rwear and also, under ordinary conditions, will outwear the metallic rods of the section so that it is necessaryto be able to reclaim these pieces when the .rods are worn, and insert new rods. vThis is particularly important when it is recognized that the rubber strips are considerably more costly than the rods. This can be readily done inthe construction described. Y

' vprovide stops for the headsof bolts 39 which ex- (c) When the screen sections of any machine `tion shown in Figs. .4, `5 and.6. s

lshaped particles becoming lodged between the rods and causing the rods to spread to the extent of, permittingoversize material to pass through the screen.

The rods are secured to the rubber blocks 2u and 2| by means of a press t sufficient to prevent appreciable movement between the rods and blocks during handling of the units or during vthe screening operations. This permits the rods to be assembled and removed in units, rather than individually, although after a unit has been removed from the screen, one or more of the rods may be removed from the blocks for replacement purposes.

The aforesaid Vconstruction whereby the rods are assembled in units outside of the machine and inserted in units in' theY machine results in a "very substantial reduction of time so lost and is important to the operators of the same'.

In cases where the rodsrequire considerable force to produce the camber, the alternative form of construction shown in Figs. 4,15 and 6 is' preferably employed. In this form of construction, the clamping members 30 `are in the form of castings having ears'i3l vand 32 which project through

openingsA

33 and 34 respectively in the side plates iv and 2'; The sidevplates have channels 35 secured thereto, yas by bolts SB'and nuts 31, and the lower flanges 38' of these channels tend through the channeliianges as well as the ears 3| and 32 of the'clamping'members 30.

The clamping members 30 are-retained in the unit. clamping position by means of nuts 40 which are in threaded engagement with the bolts 39 and bear against Vthe ears 3l.y Lock nuts 4l are provided to lock the nuts 40 againstfmovement.

By loosening the ing members 30 can be moved upwardly to -an extent limited only by the length of the slots or openings 33 and 34.l 1 A A It will be further noted that the ears 132 ofthe clamping members are provided with Vshoulders 42 which function to restrain lateral movement of the rod units in a manner similar to the bars 27 in that form of construction shown--inFig l, and that the clamping members, in this case, have secured thereto ,wear-resistant facingsV 43, of rubber or the like;

Where considerable camber` is .requiredfin vthe i rods, the'rod unitswill, `prior. to being cambered, have their outer edges at alconsiderableelevation above the ledges 4',-and the'clamping members,in order to continuously press the units from their elevated position .to ltheir ilnal position, must have a long range ofaction. Suchv a range of action is permitted by the form of `construc- In that form ofthe invention shown in Figs. 7, 8 and 9, the rod deck units extend entirely' across the screen, and are supportedat vtwo laterally spaced points instead of one.` @Each unitin this case, consists of a plurality of parallel rrods 50, the ends ofwhich arejsecured in rubbersleeves 5l, which, as shown in Fig.j9, are clampedl between metallic bars 52 and 53, having cooperat- -nuts 4G andlll, vthe clampmeans of bolts 80 and nuts 8|.

ing recesses in which the sleeves are partially received. The bars 52`and 53 are clamped to each other by means of dat headed cap screws 54, and nuts 55 disposed in counterboredfopenings 56 in the bars 52.` f

The rods 50 are encased in rubber sleeves 51 at points intermediate the centers and ends thereof, and these sleeves are encased in metallic clamp bars 58 and 59, which are similar to the bars 52 and 53. These bars are. clamped together as Well as to angles 68 of the screen frame by means of bolts 6I. It may be noted,at this point that the clamp bars 58 and 59 do not extend the-entire length of the screen, but are only as long as the clamping members I8, thereby permitting the units to be separately removed from the screen when desired. It may be further noted that the rods are maintained in an arched condition in a manner similar to the rods of the units shown in Fig. 2.

In that form of the invention shown ineFigs. 10 and l1, the rod deck units extend entirely across the screen, as in the previously described form of the invention, but the units are held down at their centers to create the double-arch effect shown in Fig. l0, which effect corresponds with that shown in Fig. 2. For this purpose, the centers of the rods 69 whichare encased in rubber sleeves 10, are secured to an angle 1I` of the screen frame by means of clamp bars 12 and 13,

and bolts 14 which extend-through-'these bars and into said angle.

The portions of the rods 69 intermediate the ends and centers are clamped to angles 15 of the screen frame in the manner clearly shown in Fig. 1l. The rods, in this case, are disposed between semi-cylindrical rubber sleeves 16 disposed in openings therefor in a clamp bar 11, and a rubber strip 18 which is vulcanized to a metal strip 19, which is secured to the angle 15 by The bars 11 are secured to the angles 15 by means of bolts 82 and nuts 83. The units, in this case, are removable from the screen in the same manner as the units of that form of the invention shown in Fig. 8.

It is thus seen that in all of the modified forms of the invention .which have been described, the advantages which inhere in the rst form'of the invention are also present. Y

It is to be understood that the form of my invention, herewith shown and described, is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to, without departing from the spirit of my invention, or the scope of the subjoned claims.

Having thus described my invention, I claim:

l. A rod deck unit for screens, said unit comprising a plurality of metallic rods, rubber sleeves encompassing the ends of said rods and points on said rods intermediate the ends thereof, metallic clamp bars engaging said rubber sleeves and serving to maintain said rods in spaced parallel relation, and means `securing said bars to each other.

2. A rod screen comprising a screen frame including a pair of longitudinally extending spaced side members each having an inwardly extending rod-end supporting ledge thereon, one of said ledges overhanging its side member and provided with a downwardly facing rod-end supporting surface, the other of said ledges being provided with an upwardly `facing rod-end supporting surface, a rod tensioning member carried by the frame intermediatesaid side members'and `disposed generally parallel thereto, saidtensioning member having a rod supporting portion disposed to support 'the rods intermediate their ends and their ends for maintaining the. rods `in spaced parallel relation independently of said frame, `the rods of said panellyingacross said tensioning member with the mounting -bar at one end of the panel disposed beneath said overhanging ledge and in engagement withsaid downwardly'facing rod-end supporting surface thereof,r and an ad.

justable clamping member on the side member having said other ledge, said clamping member' cluding 'a pair of longitudinally extending spaced side members each having an inwardly extending rod-end supporting ledge thereon, one of said .y

ledges overhanging its side member and provided with-a downwardly facing rod-end supporting surface, the other of said ledges being provided with an upwardly facing rod-end supportingv surface, a rod tensioning member carried ybythe frame intermediate said side members and dis posed generally parallel thereto, said tensioning member having a rod supporting portion disposed to support the rods intermediate their ends and from beneath a unitary rod deck panel including a plurality of metallic rods and rubber mounting bars secured to said rods adjacent their ends and at the intermediate portions thereof adapted to engage said tensioning member for maintaining `the rods in spaced parallel relation independently of said frame, the rods of said panel lying across said tensioning member with the intermediate mounting bar supported upon said tensioning member and with `the mounting bar at one end of the panelrdisposed beneath said overhanging ledge and in engagement with said downwardly facing rod-end supporting surface thereof, and an adjustable clamping member on the side member having said u other ledge, said clamping member being operable to clamp the 'mounting bar at the opposite end of the panel rmly against the upwardly facing rod-end Supporting surface of said other ledge, said rod supporting portion of said tensioning member being disposed at an elevation with respect to said ledges as to thereby bow said rods under tension. I

4. A rod screen comprising a screen frame including a pair of longitudinally extending spaced side members each having an inwardly extending allel relation independently of sad frame, the

rods of said frame, the rods of said panel lying across said tensioning member with the intermediate mounting bar supported upon said tensioning member and with the mounting bar at one end of the panel disposed beneath said overhanging ledge and in engagement with said downwardly facing rod-end supporting surface thereof, and an adjustable clamping member on the side member having said other ledge, said clamping member being operable to clamp the mounting, bar at the opposite end of the panel rmly against the upwardly facing rod-end supporting surface of said other ledge to thereby bow said rods under tension, and stoptmembers on the screen frame adjacent the rod ends for limiting longitudinal movement of said rods.

5. A rod screen comprising a screen frame including a pair of longitudinally extending spaced side members each'having an inwardly extending rod-end supporting ledge thereon, one

of said ledges overhanging its side member and provided with a downwardly facing rod-end supporting surface, the other ofA said ledges being provided with an upwardly facing rod-end supporting surface, a rod tensioning member carried by the frame intermediate said -side Vmembers and disposed generally parallel thereto,

said tensioning member having ra rod supporting portion disposed to support the rods intermediat'e their ends and from beneath, the other of said ledges being disposed below the level of the rod engaging portion of the tensioning member, a unitary rod deck panel including a, plurality of metallic rods and rubber mounting bars secured to said rods adjacent their ends and at the intermediate portions thereofadapted to vengagesaid tensioning member forr maintaining, the rods in spaced parallel relation independentlyI of said frame, the rods of said panel lying across said tensioning member with the intermediate mounting bar supported upon said tensioning member and with the mounting bar at one end of the panel disposed beneath said overhanging ledge and in engagement with said downwardly facing rod-end supporting surface thereof, and an adjustable clamping member on the side member having said other ledge, said clam-ping member being operable to clamp the mounting bar at ythe opposite end of the panel rmly against the upwardly ,facing rod-end supporting surface of said other ledge to thereby bow said rods under tension, and metal wear plates secured to said mounting bars on the surfaces thereof which are opposed to the overhanging ledge, the tensioning member and the Yadjustable clamp respectively. r y

WALTER J. PARKS.