US1673148A - Resilient suspension means for screen separators - Google Patents

Description

June l2, 1928.

J. F. lsBELL RESILIENT SUSPENSION MENS FOR SCREEN SEPARATORS June 12,1928. A 1,673,148

' J. F. ISBELL RESILIENT SUSPENSION MEANS FOR SCREEN SEPARATORS Filed June 19. 1922 z sheets-sneer 2 Patented June 12, 1928.

UNITED `STATES PATENT OFFICE.

JOHN F. ISBELL. OF ALHAMBRA, CALIFORNIA; CLFMENTINE ISBELL, ADMINISTRA- TRIX OF SAID JOHN F. ISBELL, DECEASED, ASSIGNOR OF ONE-HALF TO OT- TO Q. BECKWORTH, OF LOS ANGELES, CALIFORNIA; CLAUDIA I. SILVEY ADMINISTRA- TRIX 0F THE ESTATE OF SAID JOHN F. ISBELL, DECEASED. i

RESILIENT SUSPENSION MEANS FOR SCIR/EEN` SEPARATORS.

Application filed June 19, 1922.V Serial No. 569,496.

This invention pertains generally to inclined screen separators, for separating and sizing sand, gravel, crushed rock, ores and similar materials; and consists of new and improved means for yieldingly supporting the seperating screen, in a manner to greatly increase its efficiency and capacity. n

The vibrator mechanism which I employ in connection With the screen embodying the herein disclosed invention, is shown and described in a copending application, filed on the 19th day of June, 1922, Seria-l Number 569,495. In the aforesaid copending application the invention not only embraces the vibrator mechanism, but also embraces its use in connection with a yieldingly mounted separator screen; While the present invention is limited to the particulary construction of the screen and the manner of yieldingly or resiliently mounting it adjacent the vibrator mechanism.

The particularobject of the present invention is the provision of a yielding mounting means for a screen separator, so that it may receive its vibratory motion directly upon the central suspended area of the screen, from a vibrator mechanism mounted adjacent thereto, and whereby the vibrations so transmitted to it will not be limited to such central suspended area, but the resultant vibrating motion will be eifective throughout its entire surface, thereby adding greatly to its eiiiciency and capacity'.

In this particular case-Iprovide a means whereby the screen may not only be yieldingl'y suspended, so as to be sensitive and particularly susceptible to the transmit-ted vibrations over its entire surface, but also so this yielding support may be adjustable to malte the screen as a Whole more or less elastic and more or less susceptible to the transmitted vibrations. That is, so the transmitted vibrations Will result in agitating the screen either in a series of quick, sharp vibrations of small amplitude, ora series of less frequent and larger vibrations of comparatively greater amplitude. y

The details of construction and'function of my improvements are fully set forth in the following specification, reference being made therein to the accompanying drawings; in Which Fig. 1 isy aside elevation of my assembled separators: Fig. 2 is a plan' view thereof; Fig. 3 is a longitudinal vertical section 'ta-ken as indicated by the line 3 3 of Fig. 2; Fig. 41 is a transverse vertical section as in*- dicated by the line 1 4 of Fig. 3; Fig. 5 is an enlarged fragmentary perspective vievsr of the yielding screen support; Fig. 6 is an enlarged fragmentary detail vievv, taken as indicated by the line 6 6 of Fig. 3; Fig. 7 is an enlarged detail View of the adjustable clamp, taken as indicated by the line 7 7 of Fig. 6; and 8 is an enlarged fragmentary detail view, taken as indicated by the line 8 8 of Fig. 6.

lVhile the details of construction and eperation'of my improved vibrating mechanism are shown and described in` my aforementioned copending application, together With a screen of the type and construction comprising the present invention; I Will nevertheless describe, in a general Way, enoughv of the details of construction and method of operation of that vibrating mechanism to make the operative function of the present screen and itsv method of suspension clearly understandable.

Referring now to the drawings, and particularly to Fig. 1, the screen-generally designated by the numeral' 10 and the vibrator mechanism generally designated by the numeral .11 are mounted upon a main frame 12; the latter being ordinarily supported in an inclined position upon suitable corner posts 13, and. cross or brace members 14. These members may be constructed of any suitable material, and While I have herein shown them as being constructed of Wood, they, nevertheless, can be constructed l of ymetal if desired.l Under ordinary circumstances the material to be separated is fed to, 'the screen (which is supported Within the main frame 12') over a feed chute or distributor 15, which may be provided with any suitable means for properly distributing material across the upper receiving end of the screen. The `fines or undersized materials passing through the screen, fall into a chute 16, extending over the entire bottom of the mainframe 12, from which they may gravitate to a suitable receptacle, as shovvn4 at 17. The overframe `and having their ends supported ,inv

bearing blocks 23 and 24.` The upper blocks 23 are simple bearing blocks, while the 'lower blocks 24 ,are in the nature of pillow blocks,

having removable tops24a secured in place by cap screws 25. This is to permit the rais ing ofthe vibrator mechanism and screen from the position shown in solid lines in lfig. l,.to thatl shown in dotted lines, for the purpose of'replacing or repairing the screen; and in suoli instance the upper tubular sup-k porting member 22, rotating in its bearing blocks 23, serves as a fulcrum, Cap screws 2G inthe tops ofthe bearing blocks 23 and 24 serve to hold the tubular supporting meinbers 22 against, axial movement therein; these, however, may be loosened when itpis desired tovraise the mechanism as justdescribed.

, The vibrator mechanism is carried directly uopn the,4 members 22v by mea-ns of a pair of parallel frame members, generally designated by the numeral 27. These are identical and each consistsof base supporting members 28, and standards 29, formed eithery integral or separable as desired. In the present-'case I have shown them to .be formed'integral. The base members 28 eX- tend longitudinallyv across the screen and are adjust-ably supported upon the members 22 by means of split bearing clamps 30, formed integral with their ends.` The bearing clamps 30 are clamped about t-lie ltubular members 22 in theV usual manner, as by means ofy bolts 3l extending through suitably formed lugs or earsft'hereon. In this manner the frame members27 are made longitudinally adjustable upon the supports 22,

so thatV the distance betweenl them may be` varied or their positions may be altered relative .to the surface of the` screen 10.` They standards 29A each consists ofA a pair of .legs 29? extending upwardly from the base inem.- bers 28; these legsv being joined intermediate theirwends by an integral transverse brace member 32, and at their top ends by a removable cap 33 secured in place by cap screws 34. Bearing blocks k35 are mounted between thecontinguous faces of the `legs 29a, intermediate the transverse braces 32 and removable caps 33; these blocks having channels in their vertical edges to engage the sides ofthe legs to hold them against translscrewsBG, extending loosely through central bores 33a in the-caps 33, and screw-threadedly engaging internally screw-threadedbores -37 yin the tops of the blocks." "Lock nuts 38 hold the screws 3G Lagainst axial movement in the bores 33a.v Thus by rotation of screws 3G, blocks 35 may be vertically adjusted between the legs 29a.

Ar transverse shaft 39 is revolubly journaled in suitable bearings in the blocks 35; and a bolt pulley 40 is keyed to it intermedi ate theframe members 27; a pair of spacer blocks 41 being similarly fixed to the shaft on either side of the pulley 40 to maintain it inits `central position. A drive pulley 42 is keyed to the outer end of the shaft 39; and a pulley 43 is loosely mounted on the outer end of this shaft to which the drive belt 44 may be shifted when it is desired to put the vibrator mechanism out of operation.` The drive belt 44 may vbe operated from anysuitable source of motive power.

A rocker arm-generally designated by the numeral 45-hereinafter termed i the F vibrator beam is rigidly mounted upon a rock shaft' 46 by means of a central split bearing 47; each end of jthisshaft :being journaled in suitable bearings 48 inthe suppor-ting members 28 of frame members 27. 'lllieyil'iratofr` bea-m 45 consists of a pair of coplanar arms 49 extending outwardly from opposite vsides of the'split4 bearing 47, atright angles to its `axis and in alignment with each other; terminating at their outer ends in tubular hammer members 50 having central bores extending at substantially right angles to the plane of the coplanar arms 49, as shown` in F ig. 3.V .A1 pair ofarins 52, preferably formed integral with the bearing 47, extend upwardly therefrom in spaced relation, and at substantially an angle ofv 90o with the arms 49. A belt pulley 53 is vrevolubly mounted upon a shaft 54, carri-edin suitable bearings in the upper endsof the arms 52; this pulley 5.3 being driven from the pulley 40 by means of a belt The pulley 53 is, unbalanced by vweights 56 being secured to it eccentrically, so' that. during vits rotation these weights will have av tendency'to throw it oil vcenter and Iiiiipait an oscillatory inotion `to the vibrator beam, as4 indicatedby the arrows in Fig. 3. p

A cushioning adjustment provided iiiterinediate the vibrator beam and the frame members 27, by iii-cans of studs or pins 59 carried upon the upper edges'of the arms 49, on either side of and equi'distant from thel shaft .46; `these studs extending through apertures in bridge members 58 carried upon and between the frame members 27 g and having helical springs 59"L surrounding them and confined between the bridge members 58 and adjust-ing nuts 60 on their upper vthrough the webs.

ends. By adjusting the compression of the springs 59, by rotation of the nuts upon the upper ends of studs 57, the oscillatory motion of the vibrator beam 45 may be cushioned to vary the force of the vibratory impact-s transmitted to the screen l0.

lt may be here noted that vertical adjustnent of the bearing blocks upon the standards 29 will adjust the tension of the drivebelt intermediate pulleys l() and 53,'which will also have a cushioning eilect upon the oscillatory motion transmitted to the vibrator beam by rotation of the unbalanced pulley 53. In all cases the tension of the belt will be such as to permit this oscillatory movement, and it may be so adjusted y relative positioning of the pulley 40 as to have little or no limiting effect upon the motion of the vibrator beam, or as to have the cushioning effect, to limit this motion, above described.

The construction of the screen l0 is as follows :l

A pair of longitudinal side rails 6l, extend between and parallel with the-longitudinal side frame members 20, and the screen fabric is supported upon and between these rails, with its top and bottom edges open or unobstructed to receive and discharge the materials. The side rails 6l are preferably constructed of channel irons 62, mounted with their web faces inwardly toward each other and their channel faces outwardly, as shown in Figs. Il and 6. The screen fabric is stretched taut across and between the bottom flanges of the channels 62,

and thence brought around their outer edges and into the channels; being thus held in place by means of wedged blocxs 63 secured in the channels by bolts Gil extending lt will be noted that the wedge blocks 63 have tapered top and bottom edges to conform to the inner inclined faces of the channel flanges. In this manner the screen fabric 62 is held tightly clamped upon the channels 63, and this means is also effective in drawing the .screen taut when a light or line mesh screen is used. T he rails 6l are braced and held rigidly in spaced relation b v means of transverse brace rods 66; these rods being secured to the rails by means of base blocks 67. These blocks have flanges through which the bolts 65 may extend, and the rods 66 have a screwthreaded connection with them, so that this means may also be utilized for spreading the rails 61 for drawing the screen fabric 62 taut. Reinforcing members 68 extend transversely between the side rails 6l. along and beneath the top and bottom edges of the screen fabric 62. These reinforcing members may be made on angle iron, of suitable size, secured at each end to the rails 6l by bolts 69. rlhe screen fabric 62 is secured to the reinforcing members 68 by suitable bolts 70; these bolts having round heads protruding above the screen sur-face to otter as little obstruction as possible to the material passing over it. A resilient member 7l extends longitudinally beneath the screen fabric 62, being secured at each end to the reinforcing members 68, as by means of bolts 72. This member is preferably constructed of resilient flat metal, such as spring steel, and extends in a plane directly beneath and in alignment with the vibrator beam Ll5. I will shortly explain the function of the member 7l.

The screen l0 is yieldingly suspended from the supporting members 22, by means of hangers 73 hingedly connected at their upper ends to the outer ends of resilient supporting bars 74; the vlatter being adj ustably secured to the members 22 by means of clamps 7 5. The hinged connection'between the hangers 78 and supporting bar 74 is clearly illustrated in Fig. 5, and is preferably formed as there shown; the connection being made by a hinge pin 76, inthe form of a bolt which may be removed to permit the removal of the screen l0 from the rest of the mechanism-for vreplacement or repairs. The hangers 7 8 are preferably formed of llat metal, as shown, and may be secured to the rails 6l, intermediate the blocks 67 and channels 63 by the bolts 65 extending through suitably spaced apertures 77. This hinged connection permits lateral motion of the screen l0 relative to the main frame l2, during operation of the vibrating mechanism. lf desired, the hangers 78 may be replaced by shackles or link connections.

The supporting bars74@ are preferably constructed of thin flat metal, such as spring steel; and are so mounted upon the supporting members 22 that their resilient action may be varied to permit varying degrees of vertical motion of the screen ,that is, at right angles to the plane of the screen fabric 62. This yielding or vibratory' motion is varied by means of the adjustable clamps 75, which are illustrated in detail inFigs. 6 and 7. They consist of U-bolts'7 8 adapted to extend over and embrace the tubular supporting members 22, and thence extend through suitable apertures 79 in clamp blocks 80; the latter having central arcuate notches cut in their tops to embrace the opposite sides of the tubular supporting .members 22, as shown in Fig. 7. The straight portions of the U- bolts 78 thence extend through apertures 8l in clamp plates 82 and receive nuts 83 on their outer ends. clamped intermediate the blocks 80 and plates 82 and between the legs of the U-bolts;

and when the nuts 83 are tightened upon the- U-bolts the bars 74 and tubular supporting members 22 are clamped in rigid connection. By loosening the nuts 83 the clamps 7 5 may be moved axially along supporting members The spring bar 74 4is niei ends 5() of the vibrator beam 45, when the latter is in'its-iiormal ccntralposition;

that is, when the arms 49 are parallel to the' surface of the sci'een fabric 62. Lock nuts 8G serve to hold the studs 84 in place and washers intermediate these nuts engage the screen fabric 62 to hold it down upon the bar 7l.` The upper screw-threaded ends of studs 84 engage in internally screw threaded bores 87 in adjusting sleeves 88; and studs 89, having heads 90, likewise screw-tlireadedly engage in the -bores 87 from. their opposite ends, as clearly shown in Fig. 3. The sleeves 88 are longitudinally slit inwardly from each end, onopposite sides, and provided with clamping bolts by means of which the sleeves may be held or clamped in ladjusted position upon the studs 84 and studs 39 may be similarly clamped in adjusted position in the bores 87.

VIt will be seenr that the studs 89 extend loosely through the bores 51 in the hammerends 50 of arms 49, so that during oscillatory movement of the vibrator beam the top and bottom faces of the ends will successively impact against the top faces or ends of the sleeves 38 and the undersides of heads 90 upon studs 89. It will also be noted that when the lower face of one end 50 is impacting against the top face of one of the sleeves 88, the top face of the opposite end 50 will be impacting against the underside `ofthe head 90 of one of the studs 89. The sleeves 88 and studs 89 rare made adjustable relative.

to the screen fabric 62 and the ends 50 of the vibrator beam, so that the spaces intermediate the opposite'ends of the ends'O and the top faces of sleeves 88 and bottom faces of heads 90 of studs 89 will be exactly equal when the vibrator beam is in its normal central position; that is, parallel to the surface Y of the screen fabric 62.' Froin'the foregoing it is clear that this adjustment of the sleeves i 88 andv studs 89 relative to the ends of the vibrator beam will govern the force and amplitude of the' vibratory impacts delivered to the screen. Also, that the impacts delivered will be in the nature of impacts or blows administered successively to opposite faces of the screen fabric 62. By lengthfening the distance between theunderside of heads 90 and the top faces of the sleeves 88, the vibrations or impacts will bev less frequentand of greater amplitude, while by shorten-- ing this distance the vibrations will be more rapid and intense, and of less amplitude.

In addition to the vibratory impacts thus delivered to the screen fabric 62, through the medium of connections with the bar 7l, the yielding means for suspending the screen l() frointhe frame, as hereinbefore described, permits resultant vibration of the rails 61,.

so the entire surface of the screen fabric will be susceptible to these transmitted impulses, and the vibratory effect set up oven the entire screen surface adjacent the side rails 6l as well as throughout its central area, thereby greatly adding to the capacity and eiiiciency of the screen. The adjustable suspension means for the screen 10 to either increase or diminish its sensitiveness to the vibratory impulses delivered by the mechanism 11, permits it to be set invv accord with the several adjustments of the vibrating mechanism to efficiently handle a great many different kinds and characters of materials as well as separating them into various degrees of fineness.

Vhile I have herein shown andl described a preferred specific embodiment of my invention, and its combination with a vibrator mechanism, I nevertheless reserve the right to make such changes or modifications in structure and arrangement, as will properly come within the scope of the appended claims.

Having described. a preferred form of my invention, I claim:

l. In a screen separator, the combination ico of a screen, a yielding suspension member for .the screen comprising a fiat spring meinber extending fl'at side to the screen, spaced connections between said spring member and the screen, and supporting members engaging the spring member at points spaced from the screen connections.

2. In ascreen separator, the combinationy of a frame, a screen and yielding supporting means for the screen comprising a resilient bar, spaced connections between'said bar and screen, and spacedconnections between the bar and frame also spaced from the screen connections. 3. In a screen separator, the combination of a frame, a screen and yielding supporting ni'eans for the screen comprising a resilient bar, spaced connections between the bar and screen, and spaced connections between the bar and frame, also spaced from the screen connections, the last mentioned connection beinglongitudinally movable on the bar to vary the extent it will normally vibrate.

4. A screen separator comprising a frame, ay screen, means for yieldingly supporting the screen upon the frame so it can vibrate freely, said means comprising a resilient 5. A. screen separator comprising a frame,y

a screen, means for yieldingly supporting the screen upon the frame so 1t can vibrate freely, said means comprising a plurality of resilient members extending across the screen substantially parallel to its surface, the screen being suspended upon said members by depending connections adjacent their ends, and connections between said resilient members and the frame, said connections being adjustable longitudinally upon said members whereby the extent of their yielding movement may be varied.

6. A screen separator comprising a frame, a screen, means to vibrate said screen, means for yieldingly supporting the screen upon the frame, said means comprising a yielding member extending across the screen and connected thereto at its ends, and means intermediate the ends of said member connecting it to the frame.

T. A screen separator comprising a frame, a screen, means for yieldingly supporting the screen upon the frame so it can vibrate freely, said means comprising a plurality of fiat resilient bars extending across the screen substantially parallel with its surface and connected thereto at their ends, said members being yielding in a direction perpendicular to the screen surface, and connec tions between said bars and the frame, said connections being spaced intermediate the ends of the bars and longitudinally adjustable thereon to Vary the extent of their yielding movement.

8. In a device for separating materials 'the combination of a supporting frame, a screen, means for yieldingly supporting said screen upon the frame, said means comprising a yielding member secured at its ends to the screen, and clamping members connecting said yielding member intermediate its ends to the frame, said clamping members being independently longitudinally movable on the yielding member to vary the extent of its yielding movement.

9. In a screen separator the combination of a supporting frame comprising longitudinal and transverse members, a screen, a vi brator mechanism carried by the transverse frame members adapted to deliver vibrating impulses to the screen in a direction transverse to the plane of its surface, yielding members secured at each end to the screen and extending substantially parallel to the said transverse frame members, said members being yielding in a direction substantially perpendicular to the screen surface, clamp members carried by the transverse 'frame members and engaging the yielding members intermediate their ends, the said clamp members being independently longi tudinally adjustable on the frame and yielding members to vary the extent of vibratory movement of the material supporting member.

In Witness that I claim the foregoing I have hereunto subscribed my name this 2nd day of June, 1922.

JOHN F. IsBnLL.

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