US800693A - Shaking-screen. - Google Patents

Description

PATENTED OCT. 3, 1905.

J. A. TRAYLOR.

SHAKING SCREEN.

APPLICATION nun 1120. 2a. 1904.

3 SHEETS-SHEET l.

Z;we 717E507" 4% W yfj PATENTED OCT. 3, 1905.

J. A. TRAYLOR.

SHAKING SCREEN.

APPLICATION FILED 1330.28, 1904.

3 SHEETS-SHEET 2.

kjzorllxsy No. 800,693. EATENTED OCT. 3, 1905. J. A. TRAYLOR.

SHAKING SCREEN.

APPLICATION FILED DEG.28,1904.

3 SHEETS-SHEET 3.

JOHN Af 'lltA YLUR, Oh lHCiVlili, O liOl-l-AHO.

SHAKlNG-SCREEN.

Specification of Letters Patent.

Patented Oct. 3, 1905.

Application filed December 28 1904:. Serial No. 238,613.

1 To (all wi l/Hi1 it Hertz con/0077i: Be itknown thatl JOHN A. 'liL-n'mn, a citizen of the United States of America residing in the city and county of Denver and State of Colorado, have invented certain new and usefuldmprovements in Shaking-Screens; and I dodeclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, referencebeing had to the accompanying d rawings,

1 and to the figures of reference marked thereon,

. whichfornra part of this specification.

My inveniion relates to improvements in screens; and theobjects of my invention are, .iirst, .to provide a screen for ore-pulp and other-material having an under-wash adapted to'prevent its. clogging and to facilitate the feed; second, to provide a combined screen .andfpan arranged to screen ores and other 1 materials and to retoss the screened water and ore-pulp up against the under side of the screen and through its meshes to wash clean andfacihtate its screening ca 'iacity; third, to

' provide a screen for screening ore and other material that operates with a dill'ercntial vertical reciprocal resilient impingementagainst an abutment at the end of its upward vertical 5 frame which supports the screen-frame. ET is a view vertical sectional view on the line 3 3 of Fig. 1. Fig. 4c is an end view of the feed end of the screen. Fig. 5 isa longitudinal vertical sectional view on line 5 5 of Fig. 1. Fig. 6 is a contracted perspective view of the metal Fig. illustrating theoperation of the bum 'iing mechanism which actuates the screen-holding casing and the screen and pan, and Fig. 8 is a longitudinal sectional view illustrating a modilicd form of screen-pan.

stroke andthat has a vertical rocking hori' zontal reciprocal movement that moves the screen in alternately opposite directions to the alternatevcrt'ical rocking movements of said screen and with a differential horizontal movement; fourth, to provide a screen having a bodily-adjustable resilient vertical re cipi ocal bumping movement and a horizontal Similar numerals of reference refer to similar parts throughout the several views.

Referring to the drawings, the numerals 1 y and and 3 and a designate a rectangular frame which I term the supporting-frame of my machine, the numerals 1 and 2 designating suitable-sized side rails, which are preferably made of wood, and the numerals 3 and 4: the cross end pieces, which are also preferably made of wood and are secured to the side rails by bolts 5 or by other suitable means. To the side rails l and 2 of the supporting-frame l secure four brackets 7, 8, 9',

and .10. The brackets 7 and 8 are placed opposite each other, as are also the brackets 9 and 10, and at a distance apart to support between them at predetermined points adjacent to its ends a screen-supporting frame 11. These brackets are bolted to the side rails of the supporting-frame by bolts 12. I preferably make these brackets in substantially the form of a Z and sccu re the vertical and the reciprocal movement arranged to cooperate withthe said vertical bumping movement to in the direction of its feed; fifth, to provide a resiliently-suspended screen and a cooperating screenings-catching pan provided with a vertically-impinging bumper cradle movement,

trated in the accoin 'ianyii'ig drawings, in

i which Figurel is a plan view of inyimproved lower horizontal arms to the side rails. The top arm of these Z-shaped brackets terminates at its end in a pair of depending semicircular lugs that are spaced at a short distance apart and form a depending yoke 13 on each bracket. toss the orepulp ahead on the screenand run l screen and attachi'i'icnts, showing the same mounted upon a suitable supporting-frame. Fig, 2 is a transverse sectional view through the screen and supporting-framc, taken on the line 2 2 of Fig.1. Fig. 3. is a longitudinal l pivotally secure to the yoke 13 of each bracket one end of four links 14, preferably by four pins 15, which are secured in the yokes by split pins 16. Each of these four links depends normally vertically downward from its yoke at the end of the bracket, and at their lower ends they are pivotally secured to one end of four other links 17 and to two yokes 18, formed in the end of two connecting-rods 19. The yokes 18 straddle both of the links of the brackets? and 8, and the ends of these two links and the yokes are pivotally connected together, preferably by pins 20, which are provided with heads that are countersunk into one side of the yokes, while IIO upwardly projecting lugs 23 by pins 25.

These lugs are formed on top of four bedplates 26. which support the screen-supporting frame. These lugs project upward from 1 arms standing vertically and against the adjacent lugs, to which I securethem by the pins25, whichpass through the angle-irons and are countersunk flush with the side of the angle-irons. The pins are secured to the lugs by split pins 27, which are placed through i the ends of the pins, which project beyond the lugs.

By reference to the cross sections, Figs. 2 and 1, .it will be seen that these bed --plates 26 are suspended by the links (eight links) from the end of the four brackets 7, 8, 9, and 10,that are fastened to the opposite a side rails 1 and 2, and on these bed-plates the angle irons 28 and 29 are placed opposite each other, these bed-plates and the angle-irons forming a casing in which thescreen 30 is placed. The ends of these angle- irons 28 and 29. are connected together by smallerangle-.

irons 31and 32,.one arm of each of which extends under the horizontal arms of the angleirons 28 and29, and other arms are bent around against the outer sides of the vertical arms of the side anglesand are riveted to them, as

shown in Fig. 6, These side and end 1 anglerons form cooperatively a square casing for the screen 30, which casing issuspended by ,the. eight links from the four brackets of the side timbers. ()ne of the important features of my invention 1s, however, that this screen supporting casing shall be. under a constant upward pressure against the links and the brackets instead of hanging of. their weight from them. Iaccomplish this feature of my invention In the following manner: Through the top arm of each bracket 1 form apertures 33,. through each of which a rod 1A hangs loosely and vertically. These rodsare supported by nuts 35, that are threaded to the ends of the rods, and washers 36 surround the rods below thenuts and rest on springs 37, one :end of which rests on thetops of the brackets, and the washers rest on theoppositc ends. in the lower end of these rods eyes are formed that areconnected to eyebolts 38, that are secured to the bed-plates. The nuts at the tops of the rods are screwed down to compress the springs enough to continuously hold the entire screen-su 'iporting casing under an upward expansive spring-pressure suliicient to cause them to assist or act in con unction withthe links to raise the screen against its bumpers, as will be explained more fully Each pair of links that connect the screen-sopportmg frame to the brackets be explained hereinafter.

forms a toggle-joint, and I connect the center of each toggle on each sideof the screen-frame to connecting-rods 19, which on one end are 'iivota lly secured to the pins 20 and to the links 1% and 17, as above described. The opposite end of these connecting-rods are pivotall y connected, res 'icctively,to the upper ends of two rock-arms 39 by pins 4:0. The upper ends of these arms are secured to a rock-shaft 41, that is mounted in boxes 42, which are secured on the side timbers 1 and 2. The links of the brackets 9 and 10 are pivotally connected by pins 13 in slots that are formed centrally through the connecting-rods. These connecting-rods are made of three pieces each 15, 4:6, and 18. The pieces a5 are links that form one end of the connecting-rods, and they are pivotally connected at one end to the rockarms 39. The opposite ends of these links are pivotally connected to yokes 46, formed on the ends of the pieces 46 of the connecting-rods.

The two pieces of the connecting- rods 46 and 18 are connected together by longitudinallyadjustable couplings which comprise the threaded rods 19, the rear ends of which screw into threaded holes that are formed in the free ends of the pieces 46, and their opposite ends thread into threaded holes that are formed in the ends of the free ends of the pieces 18. The rods 19 are each provided with two nuts 51, which screw up against the ends of the pieces 16 and 18 and lock them to the threaded rods in adjusted positions. These adjustable connections permit the relative distances between the links to be adjust ed to permit both sets of links to depend verticall y should the distances between the brackets vary in the construction of a number of these screens, while the links make jointed connections between the connecting-rods and the arms that permit independent movement of each. The rock-arms 39 receive their oscillating motion from an eccentric 52 and an eccentric-rod 53, the eccentric being secured to a shaft 54:, that is journaled in boxes 55, that are secured to the under side of the side timbers 1 and 2. The free end of the rod 53 is provided with a thread and with nuts 56 and 57 at opposite ends of the thread. Gollars 58 and 59 are placed against the nuts. The free end of the eccentric-rod extends loosely through an arm 60, that is secured to the rock-shaft 11 and is held normally centrally between the nuts and collars by two coiled springs 61 and 62, which are placed on the rod between the collars and the opposite sides of the arm, against which they are held under an equal and suitable expansive pressure to operate the links as desired, as will To the shaft 54: l secure a cam 56". This cam is adapted as it is rotated with the shaft to engage the end of a buffer-block 56", that forms a part of a yoke 57", one end of which.

isconnected to the rear end of a connecting- ICC , washer, thus securelyholding thetu be.

rod '7, the opposite end of which rod is connected loosely by means of a. yielding connection to a clip 59, that is bolted in any con venient manner to the middle portion. of a. channel-bar. 59, that is secured to the under side of the screen-holder. This cl'ninnel-bar .islocated centrally of the width of the screen and is bolted at one end to the anglebar 3i and at its opposite end to theangle-lmr 32 'lheyielding connection of the connectingrod 5'7 with the clip 59" is formed by passing the forward end of the connecting-mil through a hole in the depending end of the cli.p,rubber blocks 59" being placed upon the rod, oneon each side of the depending end of the clip, which blocks are held against the and awashcr 57" is slipped thereon against the timber. A nut is then secured against the The opposite or outer end of the rod 57 is threaded,and a nut 57 is secured thereon,and a coiled spring 57" is placedon the rod between the nut and the end timber 4:. A collar 57" is screwed uponthe forward end of the tube 5'79, and a coiled spring57" is placed on the rod between the collar 57 and the yoke. Thus as the cam 56" rotates against the butter-block 56" the yoke 57" is moved rearward, carrying with it the connecting-rod 57 If and the screen,

the spring 57 being compressed thereby between the collar 57 and the end of the yoke,

and when the cam passes thebuifer-block the yoke and the connecting-rod and screen are thrown violently forward, causing the water and ore-pulp which has been tossed into the air by the vertical impact of the screen against its buffers to fall back onto the screen a little nearer-its discharge end than the point from which it was tossed, as will be explained more fullyhereinafter. The spring 51" at the rear end of the connecting-rod 57" will cushion the impact of the screen at the limit of its forward throw.

Upononc end of the shaft 54:

tpowera'eceiving pulley issecured, an idle pulley being mounted adjacent thereto.

Adjacent to each corner of the screen-supporting casing and tothe outside ofthe angle- .rons 28 and 29 I secure four short vertical irms or buffer-standards 61 by bolts 62, the

standards l secure four Z-shaped angle-irons fit), the top of each of which extends directly over the top of the bul'l'erstandard adjacent to it. 'ihrough the top of each bracket I insert adjustable screws 63", which I term adjustable miner-screws. I place these screws in position to stand directly over the bufferblocks. The lower ends of these adjustable buffer-screws are provided with beads, and their upper ends are provided with checknuts 66, which are threaded to the screws on top of the brackets to lock the screws in adj usted positions. These bufier-blocksare made wider than the heads of the screws transversely of the longitudinal movement of the screen-frame,and they are made enough longer than the length of the adjustable bumperscrews in order that the buffer-blocks may strike them at the opposite ends of the horizontal reciprocating stroke of the screen-casing and screen.

T he screen 30 comprises a screen-su 'iporting sash which fits loosely into and rests on the lower arms of the angle- irons 28, 29, 31, and 32 of the screen-supporting casing. The sash consists of double or two-part sash, which comprises the upper sash 67 and the lower sash 67". The screen 30 is supported by the upper sash 6'7, and the lower sash 67 supports a pan 6'7. The top sash is adapted to support wire screen-cloth of any size mesh from the coarsest to the finest mesh practical for screening material.

. ,l n screening ores for subsequent treatment to'rccovcr their values by the several processes in use screens varying from twenty to eighty mesh are most generally employed. Screens of this fineness when supported by open framework invariably sag under the continual weight of ore under rapid agitation, or when the line screens are supported by a coarsemesh screen the bends in the wire of the coarse-mesh screen will cut out or wear away the liner scrcenco\ 'ering, and I have found in practice that it is necessary to more evenly support the entire bodyof the screen to avoid its breaking and enable it to wear evenly until worn out by the ore. I carry out this feature of my invention in the following manner: The top sash is provided with crossbraccs 67, and transversely across the braces and the top surface of the top sash I place a plurality of small wires, preferably spacing them several inches apart across the frame and drawing them tight, securing them by any suitable means to the sash. Over these wires and the cross-braces .I place a screen of wires or of slotted sheet metal, preferably securing the screen to the sash by tacks, nails, or screws. The screen then rests directly on the wires and cross-braces and is supported by them substantially evenly throughout its entire surface and is elfectually prevented from sagging enough to crack and break it. The lower or bottom sash 67 is of exactly charge-spouts 67", which extend across the onthe surface of the pan, whichth rough the I through the screen for the purpose of washingycleaninggand disintegrating any talcy rugations preferably extend at right angles wholly across the pan or arranged in any prejustable screws 70 at one of their ends and the surfaceof the pan. vThese corrugations may or. square, irregular, or Xshaped-and they are made to pro ect high enough above the breadth of the screen. if form across the surface of the pan a series of water or ore-pulp baffle-bars 67, arranging theinat right angles to thefiow ofthe water on the pan below the screen-surface and also to form abutments medium of the reci nrocating and verticallyswinglng movement of the screen will toss the water as liIflOWS against the l.)afile-l. ars up material or sand or ore sticking in the meshes of the screencloth and also to assist in disintegrating any lumps of material passing over the screen and to irrigate, wash, and disseminate the ore passing over said screen. in obtaining this result I may employ the bafiiebars as described above, or I may form in the body of the pan a series of upwardly-"extending corrugations 67" at suitable intervals apart in the length of the pan. These corto the flow of the ore-pulp across the pan. My invention contemplates the arrangement of these bafiie corrugations or bars at any desired angle and extending either partially or determined zigzagor stepped order on the alsoibe of any desired shape-;-such as concaved level surface of the pan to cause the water that isflowing through the screen to be tossed up against and through the meshes of the screen.

lsecurelthe screen and its sash in the cas: ing by means of two removable side strips 68 and.69, which are preferably made of wood. These strips are clamped down on top ofthe screen and sash at its opposite sides by the adswinging bolts 71 at their opposite ends. The adjustable screws 70 are threadedly secured in the top of angle-irons 72, that are secured to the side of the end angle-iron 31. The tops of these screws are adapted to receive a wrench, and the screws are turned against thecnds of the stripspwhich are simply slipped under them,and they are clamped down against the screen and sash. The opposite ends of the screen-clamping strips are bifurcated to form a yoke, and the swinging bolts 71 are pivotally connected to a clip 7 2, that issecured to the end angle-iron 32. These bolts swing up intothc slots of the yokes, and their nuts are turned to clamp the strips and the screen and sash to the casing.

A feedhopper 73, which I illustrate in Figs. 2 and 3 only, is arranged inoperative relation to the feed end of the screen. This feedhopper may be of any suitable form or construction that is adapted to feed the ore evenly and regularly onto the entire Width of the end of the screen. This hopper is outlined in dotted lines in Fig. 2 and is shown partially broken away in Fig. 3. It is set between the side clamps of the screen and is supported far enough above it to allow the screen operative movement by rods 74:, which extend to and are secured to the siderails l and 2. In the practical operation of my improved screen it is set at a downward inclination that Will permit the ore to flow from the hopper onto the screen and move over its surface toward its discharge end only as fast as the fines that are in the ore will settle out of the ore and sift through the screen. In generalmill practice several screens may be arranged in tandem order, the screens ranging from a coarse to a very fine mesh, the coarsest screen being first in order, so that the second may screen the tailings from the first and the third the tailing-s from the second, and so on.

The operation of my improved screen is as follows: Power being applied to the shaft 54:

the cam imparts a differential horizontal resilient reciprocating movement to the screencasing and the screen and sash as the casing I is suspended by the toggle-links from the brackets 7, 8, 9, and 10. A differential vertical resilient movement is also imparted by the eccentric 52 and its rod 53 to the rock-arm 60, which imparts an oscillating motion to the rockshaft 41, which in turn imparts, through the medium of the rock-arms 39, a reciprocating motion to the connecting-rods 19, and the connecting-rods, owing to their being connected to the links which lift the screen against the bin'npers and impart a vertical reciprocating cradle-like movement to the screen which, taken in connection with the compensating springs 61 and 62and the rock-arm 60 on the connecting-rod 53 of the eccentric 52, acts as follows: The adjustable bumper-screws are set to give any desired practical vertical movement to the screen, and assuming that a moderately-violent vertical stroke is desired the adjustable bumper-screws are set, so that the bu mper-blocks will strike the heads of the screen before the connecting-rods and the toggle-links have made their full stroke; but as the connecting-rod 53 of the eccentric must make its full stroke the difference, in the strokes is compensated, and each is allowed to work independent of the other by means of the springs 61 and 62, which are compressed against the opposite sides of the rockarm 60 by the full strokes of the connecting-rod 53 during its reciprocal movements. 'lhese reciprocal-inoveinent-eom 'iensatingspringsalso operatein con unction with the vertical spri ngtion in this respect beingas lk'illowsz Ass-Linn ing that the connecting-rods 1S) and the links '14 and 1? are standing at the end ol their backward and upward strokes as shown in i Fig. 7, as the CCCGTltl'iG-l'Od 53 moves Forward in the direction of the arrow 8d the spring 62 pushes against therock-arm (:30 and pushes it w ahead of it, and this rock-arm througl'i the s medium of the rock-arms J-39 and rock-shaft &1 moves the connecting-rods 19 and the links H and 1' also in the directionol the arrow 81;

but'as the links and the cranksarn'i stand at an angle toward the direction in which the occentric-rod is pushing they start slower and move slower than the eccentric-rod is moving,

3 1 Consequently the compression may be said which causes the rock-arm 60 to resist the push of the spring 62 and to compress it beof the spring 62 takesplace quickly, as the eccentric-rod, rock-arms, and the connecting rods make fronronehund red and liftyto two hundred and hfty reciprocations per minute.

to be practically instantaneous, and this compression continues until the links pass their yerticalfcenters. The links are also assisted to resist the 'l orward push of the con'i 'iensating springs (52 against the rock-arm 60 by l the upward expansive tension of the vertical rods 34, the springs 3'1 ot-which exert a coni stant upward pressure againstthe downward 4Q links when moving from the position shown and forward movement of the links, as the in Fig; 7 movethe screen down and 1601]]- press the spring 37 on the vertical rods; but

i when thelinks pass their vertical centers and i swing up to thelimit of the are of their swinging movement as delined by their radius from the pivoted connection to the brackets T, 8, 9,

and 10, they resiliently jerk the screen up until its bumper-blocks strike the ad ustable bumper screws' Consequently when the connecting-rods 19 move the links forward the links force the screen don-'nward against the resistance of the resiliei'it pressure of the vertical spring-rods 3-1, which resistance further tends to con'ipress the compensating spring 61. "The resistance consequently increases until the links pass their vertical center, when the resistance is instantly reand 17 to jump violently forward in the forward upstroke ot' the links, which are also thrown up by the upward expansive spring 3'? of the vertical rods 34:. This quick upward movement of the links as they pass their vertical centers throws the screen bodily upward until the bumper-blocks strike violently against the adjustable bumper-screws. li the bumpers are set so that the bumperblocks strike the bumper-screws before the links complete their full stroke, the links and the connecting-rods stop also when the bumpers strike, but the eccentric-rod 53 continues to the full limit of its stroke by com pressing the spring 61, as above described. Thus these springs 61 and 62 form a compensating yielding cushion for the variable vertical reciprocating strokes of the bumpers and the fixed stroke of the connecting-rod 53 by which the vertical reciprocal movement of the screen is effected. hen the compensating rods follow in the same manner and the compensating spring 62 on the opposite side of the rock-arm is compressed as the links move down and backward to their vertical centers, they compress the springs 37 of the vertical rods, and the instant the links pass their centers they and the screen spring up, causing the screen-bumpers to again strike the adjustable bu inper-screws. Consequently the screen receives two vertical bumps at each full stroke of the eccentric and the connecting-rods. The motions of the links, connecting-rods, the vertical spring-rods, and the compensating springs, however, do not alone give to the screen its entire operative movement. The resilient reciprocating com- 'iensating throw movement of the yoke and its connecting-rod moves the screen with an even movement in the direction of the flow of the ore-pulp across the screen, and then jerks or throws the screen with a sudden resilient movement in the opposite direction to the direction of the flow of the ore-pulp. The slow even movement imparted to the screen by the cam and yoke takes place at the same time the screen is swinging to and fro under s the action of the connecting-rods, toggle-links,

and rock-shaft; but the quick throw of the screen by the springs)? takes place at the moment the cam slips off the abutment 56 and at the instant the screen is swung up against its bumpers by the toggles and its vertical lifting-spring 37. The swinging movement of the togglelinks and the vertical impingement of the screen by the springs 37 against the bumpers tosses the ore-pulp flowing over the screen into the air and causes the ore-pulp to fall on the screen ahead of the place where it was tossed into the air, as the screen is thrown back under it while it is in the air. The-same action takes place on the pan, and the screened ore-pulp, which is thrown against the bafflebars by the swinging movement of the screen due to the toggle-links, is tossed into the air when the screen strikes its bumpers, and the screen is jerked or thrown back under the screened ore-pulp, causing it to shoot in short circular loops from each battle-bar up against and through the meshes of thescrcen above,

as the pan is positioned just far enough below the screen to enablcthe momentum of the screen to accomplish this and causing the orepulpto fall back onto the pan ahead of the bafl'le-bar it was tossed up from. I preferably reciprocate the screen horizontally in the reversedirection to the vertical s\\'inging movement ol the links in order to reciprocate the screen in a substantially vertical plane.

Thus when the connecting-rods andlinks are 1 moving in thedirection of thearrow, and the screen under the action of the cam whlch IS secured centrally upon the shaft 54 is moving in the direction of the arrow and is pusha *ing against the upward lift of the links at'ter they pass their vertical center-sand move upward, the resultis that the backward horizontal a movement of the screen is pushing against. the onward upward straight move- 3 ment of the screen due to the upward swing in a substantially vertical plane.

of the links, which naturally lifts the screen "upward to one sideot' its vertical alinement. Consequently the result of these counter movements is to lift and reciprocatethe screen This compound vertical and horizontal movement gives to the screen an intensity of vibrating motion in thedirections best adapted to keep every particle of ore in intense livemotion, which efiectually sit'ts the liner particles ot'thegranulated ore from the coarser particles and pre vents clogging, thus enabling the screen to be worked to its fullest ca iiacity.

dHaving. described my invention, what I claim as new, and desire to secure by Letters Patent, 1si X 1. In a shaking-screen, a screen-support 19 comprising a sash, independentsupportingwires secured tightly across said sash, a screen laidion top of said supporting-wiresand secured to said sash, a second sash. a pan secured to said second sash beneath said screen, aplurahty t pro ectlng bafl'le-bars formed on .thetop surface of said pan, and arranged in predetermined order and arrangement, and

oneofsaid rods and said screen and pan for means including the cam, the yoke, the springcontrolled rods, the abutment and thespringcompensating connection between one end of imparting a reciprocatingjerk or throw movementto said screen and pan that will cause the baiile-bars to throw the water behind them upjagainst and through the meshes of said screen, substantially as described.

2. ln'a shaking-screen, the combination wlth a pa1r;of sashes, a pan clamped between said sashes; a screen upon the upper sash above said pan and meansfor clamp ng said screen upon said sash; of the cam andspringoperated reciprocating device secured centrally beneath said sashes; buffersad acentto the :corners of said screen; and ad ustable stops, above and in the path of said butlers.

r 3. In a shaking-screen, a pair of sashes; a pan clamped between said sashes; cross-braces extending lengthwise of said upper sash; a plurality of wires extendingacross said braces;

a screen supported on said wires; means for clamping said screen to said upper sash, and a cam and spring-operated device for operating said screen.

4. .ln a shaking-screen, the comhinationof a supporting sash havlng a bed or wires stretched across it, a screen secured to said sash and resting on said bed of wires, with a sash provided with cross-braces arranged to register with said screen sash, and adapted to [it under it, a pan secured on said sash and braces and having bars or raised projections on its surface at predetermined distances apart, a feed-hopper at one end of said screen and means for discharging material from said screen and pan, substantially as described.

5. In a shalung-screen, a combined screen and a screenings-catching pan, comprising a double supporting-sash separated into two parts, a screen secured to the top part, a pan secu red to the lower part, bafile-bars arranged across said pan fthllglll) angles to the flow of reciprocal stroke, comprising a cam rotatably mounted adjacent to said screen, a yoke-shaped casting surrounding said cam, having a bumper-head arranged to be engaged by said cam, a tube secured in the rear of the supporting-frame, an ad ustable collar on the forward end of said tube, a rod secured at one end to said yoke and ex tending loosely through and beyond said tube, a nut on the outer end of said rod, a spring on said rod between said nut and said supporting-frame, a coiled spring on said rod between said adjustable collar and said yoke, a rod connected at one end to the opposite end of said yoke, provided with a turnbuckle connection between its ends and having its opposite end provided with oppositely-arranged adjustable buffers and means for attaching saidshaking-screen to said rod between said buffers, substantially as described.

7 In an inclined shaking-screen, the combination of an operatively-supported screen provided with a supporting-bed of parallelarranged wires for supporting said screen throughout its surface, a screenings-catching pan positioned below said scrcen,and arranged to be reciprocated with said screen, a plurality of raised projections on the surface of said pan arranged inany predetermined order and direction, a discharge-spout at the discharge end of said pan with a power-operated reciprocating device arranged and adapted to im :part a spring-actuatedi|npnlse throw-stroke in the direction of the iiowot material over said screen and pan, and com 'n'ising a rod ranged to throw said rod in the opposite di rection of its reci proeal movement, a clip depending from said screen and pan, a threaded end on one end of said rod extending loosely through said clip; a nut on each side of said clip on said rod; a resilient buffer on each side of said clip between each nut and the adjacent side of said clip, whereby a spring compensating connection is made between said reciprocating rod and said screen, and pan, and means for rotatingsaid cam, substantially as described.

in testimony whereof I afi ix my signature in presence of two witnesses.

JOHN A. TRAYLOR. \Vitnessesz' (7+. Sane nN'r Enm'orr, B assric THOMPSON.

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