US 777317 A
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Description (OCR text may contain errors)
m2771317. PATBNTED DEG. 13, 1904.
' J. .TRAYLOR.
SHAKING ORE SCREEN.
APPLoATIoN YILBD MAR. z5, 1904.
N0 MODEL.` 3 SHEETS-SHEET 1.
bq L0 i n NB v u? 5in/mank@ a #d @if L() l 0,4 f t Wr. F V 4h27/ 623%, i? n www No. 777,31?. PATENTED DEG. 13, 1904.
' J. A. TRAYLOR.
SHAKNG URE SCREEN.
APPLIDATIN FILED MAB.. 25, 1004..
N0 MODEL. 3 SHEETB-SHEBT 2.
2% f E m FH u i IN N 'a No. 777,31?. PATENTBD DEG, 18, 1904. Cf. A. TRAYLOR.
SHARING ORE SCREEN.
APPLICATION FILED MAE. 25, 1904.
N0 MODEL. GBHEETS-BHEET 3.
weyf, 1 massa: I
lhvirnn Srarns Patented December 13', 1904.
JOI-1N A. TRAYLUR, OF DENVER, COLORADO.
SPECIFICATION forming part of Letters Patent No. 777,317, dated December 13, 1904.
Application led March 25,1904. Serial No. 199,987. (No model.)
To (if/ZZ whom t 11i/ay con/cern.'
Be it known that l, JOHN A. Taarten, a citi- Zen oi' the United States of America, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Shaking' Ore-Screens; and l do declare the Yfollowing to be a t'ull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the lligures of reference marked thereon, which term a part of this speciiication.
My invention relates to improvements in screens; and the objects of my invention are, iirst, to provide a screen ior screening ore and other material that operates with a vertical reciprocal resilient impingement against an abutment at the end of its upward vertical stroke and that has a vertical rocking horizontal reciprocal movement that moves the screen in alternately-opposite directions to the alternate vertical rocking movements 0i." said screen; second, to provide a screen having a a bodily-adjustable resilient vertical reciprocal bumping movement, and, third, to provide a resiliently-suspended screen provided with a vertically-impinging bumper-cradle movement, combined with a cooperating horizontally-reciprocating cradle movement.
I attain these objects by the mechanism illustrated in the accoi'npanying drawings, in which-d Figure 1 is a plan view oil my improved screen and attachments, showing the same mounted upon a suitable supporting-trame. Fig. 2 is a transverse sectional View through the screen and supporting-frame, taken on the line 2 2 of Fig. l. Fig. 3 is a longitudinal vertical sectional view on the line 3 3 of Fig. 1. Fig. l is an end view of the feed end of the screen. Fig. 5 is a longitudinal vertical sectional view on line 5 5 of Fig. 1. Fig. 6 is a contracted perspective view of the metal frame which supports the screen-frame, and Fig. 7 is a View illustrating the operation oi' the bumping mechanism which actuates the screen-holding casing.
Similar numerals of reference refer to similar parts throughout the several views.
Referring to the drawings, the numerals .l and 2 and 3 and t designate a rectangular iframe, which l term the i supporting-lrame oil my machine, the numerals 1 and 2 designating suitable sized side rails, which are preterably made or wood, and the numerals 3 and t 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. '.lo the side rails 1 and 2 oi' the supporting-frame I secure :t'our brackets 7, 8,- 9, and 10. The brackets 7 and 8 are placed opposite eachother, 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 screensupporting frame l1. These brackets are bolted to the side rails of the supporting-irame by bolts 12. lA preferably make these brackets in substantially the form oit' a Z and secure the vertical and the lower horizontal arms to the side rails. The top arm of these Z-shaped brackets terminates at its end in a pair oi' depending semicircular lugs that are spaced at a short distance apart and form a depending yoke 13 on each bracket.
l pivotally secure to the yoke 13 of each bracket one end of four links 14, preferably by four pinsl, which are secured in the yokes by split pins 16. Each of these four links depends normally vertically downward Yfrom their yokes at the end of the brackets, and at their lower ends they are pivotally secured to one end of four other links .17 and to two yokes 18, 'formed on the end oi' two connecting-.rods 19. The yokes 18 straddle both of the links ot the brackets 7 and 8, and the ends oi' these two links and the yokes are pivotally connected together. preferably by pins Q0, which are provided with heads that are countersunk into one side of the yokes, while the opposite ends of the pins are provided with split pins 21. The opposite ends of the four links 17 are pivotally secured between upwarrlly-projecting lugs 23 by pins 25. These lugs are :formed on top ol? four bed-plates E2G, which support the screen-supporting iframe. lhese lugs project upward from the central portion of the bed-plates, which extends a sufficient distance on each side of the lugs to form shelf portions on each side of them. Upon the inner shelf of each pair of these bed-plates I place angled irons 28 and 29, that have arms of unequal lengths, placing them on the plates with their longest arms standing vertically and against the adjacent lugs, to which I secure them by rivets 25". The pins 25 also pass throug'h the angle-irons and are countersunk iush with the side of the angle-irons. The pins are secured to the lugs by split pins 30, which are placed through the ends of the pins which project beyond the lugs. By reference to the cross-sections, Figs. 2 and 4, it will be seen that these bedplates 26 are suspended by the links 14 and 17 (eight links) from the end of the four brackets 7, 8, 9, and 10, that are fastened to the opposite 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 the screen 30 is placed. The ends of these angleirons 28 and 29 are connected together by smaller angle-irons 31 and 32, one arm of each of which extends under the horizontal arms of the angle-irons 28 and 29, and other arms are bent around against the outer sides of the vertical arms of the side angles and are riveted to them, as shown in Fig. 6. These side and end angle -irons form cooperatively a square casing for the screen 30, which casing is suspended by the eight links from the four brackets of the side timbers. One of the important features of my invention is, 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. I 'accomplish this feature of my invention in the following manner: rIhrough the top arm of each bracket I form apertures 33, through each of which a rod 34 hangs loosely and vertically. These rods are supported by nuts 35, that are threaded to the ends of the rods, and washers 36 surround the rods below the nuts and reston springs 37, one end of which rests on the tops of the brackets, and the washers restion the opposite ends. On the lower end of these rods eyes are formed that are connected 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-sujiiporting casing Linder an upward expansive springpressure suiiicient to cause them to assist or act in conjunction with the links to raise the screen against its bumpers, as will be explained more fully hereinafter.
Each pair of links that connect the screensupporting frame to the brackets forms a toggle-joint, and I connect the center of each toggle on each side of the screen-frame to connecting-rods 19, which on one end are pivotally secured to the pins 2O and to the links 14 and 17, as above described. The opposite ends of theseconnecting-rods are pivotally connected, respectively, to the lower ends of two rock-arms 39 by pins 40. 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 43 in slots that are formed centrally through the connecting-rods. These connecting-rods are made of three pieces each, 45, 46, and 47. rIhe pieces45 are links that form one end of the connecting-rods,
and they are ypivot-ally connected at one end to the rock-arms 39. The opposite ends of these links are pivotally connected to yokes 46A, formed on the ends of the pieces 46 of the connecting-rods. The two pieces of the connecting-rods 46 and 47 are connected together by longitudinally-adjustable couplin gs,
which comprise threaded rods 48, one end ofA which screws into threaded holes that are formed in the free end of the pieces 47, and' their opposite ends thread into threaded holes that are formed in the ends of the free ends of the pieces 46. The rods 48 are each provided with two nuts 51, which screw up against the ends of the pieces 46 and 47 and lock them to the threaded rods in adjusted positions. rIhese adjustable connections permit the relative distances between the links to be adjusted to permit both sets of links to depend vertically 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 56 and the eccentric-rods 53 and 57, the eccentric being secured to a shaft 54, that is journaled in boxes 55, which are screwed to the side timbers 1 and 2. The free end of the rod 53 is provided with a thread and with nuts 56A and 58 at opposite ends of the thread. Collars 57A and 59 are placed against each nut on the threaded portion. The free end of the connecting-rod extends loosely through an arm 60, that is secured to the shaft 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 be explained hereinafter.
To the shaft 54 I secure an eccentric 56A, which is provided with an eccentric rod. The opposite end of this eccentric-rod 57 is pivotally secured by a bolt 58l to a clip 59, that is secured to the bottom of the end angle-iron 32 at the center of its width. Upon one end of the shaft 54 a power-receiving IOO IIO
pulley is secured. Adjacent to each corner of the screen-supporting casii'ig and tothe outside of the angle-irons 28 and 29 l secure four short vertical arms or buffer-standards 6l by bolts 62, the top of each of which extends over and is set into a notch formed in the top of the angle-irons. The tops of these l cover with one or more thicknesses of leather, which are secured to opposite sides of the standards with screws (52, and to the side rails opposite each of these four standards I secure four Z-shaped angle-irons 6 the top of each of which extends directly over the top of the bu derstandard. adjacent to it.
Through the top of each bracket l insert adjustable screws 63", which l term adjustable buffer-screws.7 l place these screws in position to stand directly over the builerblocks. The lower ends of these adjustable buffer-screws are provided with heads, 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 ady justed positions. These buffer-blocks are 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 bumper-screws in order that the bufferblocks may strike them at the opposite ends of the horizontal reciprocating' stroke of the screen-casing and screen 30. comprises a screen-supporting sash 67, 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 G7 is provided with cross-supports 68. This sash is adapted to support wire-screen cloth of any size mesh from the coarsest it is practical to use for screening material to the finest.
ln screening ores for subsequent treatment to recover their values by the several processes in use screens varying from four to one hundred mesh are employed, and screens varying from twenty to eighty mesh are most generally employed. Screens of this iineness when supported by open framework inval-i ably sag Linder the continual weight of ore under rapid agitation and will soon cut out or break at the edges of the sash, and I have found in practice that it is necessary to more evenly support the entire body of 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: *Over the top of the sash I lirst secure a sheet of coarse-wire screen, which I term the screen-bed. l preferably make this screen-bed of about one-inch mesh and secure it tightly to the top of the sash with suitable tacks, nails, or screws, and preferably sink that part of it that rests on the crosssupports of the sash into them until the top of the screen is flush with them, which gives The screen 30` additional stiffness and rigidity to this screenbed. I then lay a sheet of screen-cloth of the desired [ineness over the screen-bed and secure it to the sash with tacks or nails or screws. This screen-bed bodily and evenly supports the screen throughout its extent and ell'ectually prevents it from sagging' enough to crack and break it.
l secure the screen and its sash in the casing by means of two rei'novable side strips 68 and 69, which are preferably iliade of wood. These strips are clamped down on top of the screen and sash at its opposite sides by the adjustable screws 7() at one of their ends and the swinging bolts 7l at their opposite ends. rlhe adjustable screws 69 are threafiledly secured in the top of angle-irons 72, that are secured to the side of the end angle-iron 31. The top of these screws is adapted to receive a wrench, and the screws are turned against the ends of the strips, which 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 70 are pivotally connected to a clip 72A, that is secured to the end angleiron 32. These bolts swing up into the slots of the yokes, and their nuts are turned to clamp the strips and the screen and sash to the casing.
A feed-hopper which l illustrate in Figs. 2 and 3 only, is arranged in operative relation to the feed end of the screen. This feed-hopper 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 73, which extend to and are secured to the side rails l and 2. 1n 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 iines that are in the ore will settle out of the ore and sift through the screen. In general mill practice several screens are arranged in tandem order, each one from the first to the last being provided with a coarser screen than the first screen, which should be the finest, so that the second may screen the tailings from the lirst and the third the tailings from the second.
The operation of my improved screen is as follows: Power being applied to the shaft 54, the eccentric imparts a horizontal cradle-like movement to the screen-casing and the screen and sash, as the casing is suspended by the -toggledinks from the brackets 7, 8, 9, and 10.
A reciprocating movement is also imparted by the eccentric 52 and its rod to the :rock- IIO arm 60, which imparts an oscillating motion to the rock-shaft 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 bumpers and impart a vertical reciprocating cradle like movement to the screen, which, taken in connection with the compensating springs 61 and 62 and the rockarm 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 bumper-blocks will strike the heads of the screws before the connectingrods 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 rock-arm 60 by the full strokes of the connecting-.rod 53 during its reciprocal movements. rI hese reciprocal movement-compensating springs also operate, in conjunction with the vertical spring-rods 34, to impart a quick vertical throw or toss to the screen against the bumper-screws as they pass their vertical centers, their action in this respect being as follows: Assuming that the connecting-rods 19 and the links 14 and 17 are standing at the end of their backward and upward strokes, as shown in Fig. 7, as the eccentric-rod 53 moves forward in the direction of the arrow 80 the spring 61 pushes against the rock-arm 6() and pushes it ahead of it, and this rock-arm, through the medium of the rockarms 39 and rock-shaft 41, moves the connecting-rods 19 and the links 14 and 17 also in the direction of the arrow 81; but as the links and the crank-arm stand at an angle toward the direction in which the eccentric-rod is pushing they start slower and move slower than the eccentric-rod is moving, which causes the rock-arm 60 to resist the push of the spring 61 and to compress it between itself and the collar 58, while the tension of the spring 62 on the opposite side of the rock-arm 60 is relaxed. rEhe compression of the spring 61 takes place quickly, as the eccentric-rod, the rockarms, and the connectingrods make from one hundred and fifty to two hundred and fifty reciprocations per minute. Consequently the compression may be said to be practically instantaneous, and this compression continues until the links pass their Vertical centers. The links are also assisted to resist the forward push of the compensating spring 61 against the rock-arm 60 by the upward expansive tension of the vertical rods strike the adjustable bumper-screws.
34, the springs 37 of which exert a constant upward pressure against the downward and forward movement of the links, as the links when moving from their position as shown by the dotted lines 82 move the screen 30 down and compress the spring 37 on the vertical rods; but when the links pass their vertical centers and swing up to the limit of the arc of their swinging movement as defined by their radius from the pivoted connection to the brackets 7, 8, 9, and 10 they resiliently jerk the screen up until its bumper-blcks onsequently when theconnecting-rods 19 move the links forward the links force the screen downward against the resistance of the resilient pressure of the vertical spring-rods 34, which resistance further tends to compress the compensating spring 61. The resistance consequently increases until the links pass their vertical center, when the resistance is instantly relieved, which causes the compressed compensating spring to violently expand against the rock-arm 60, causing it and the rock-arms 39 and connecting-rods'19 and the -links 14 and 17 to jump violently forward in the forward upstroke of the links, which are also thrown up by the upward expansive spring 37 of the vertical rods 34. This quick upward movement of the links as they pass their vertical centers throws the screen bodilyupward until the bumper-blocks strike violently against the adjustable bumper-screws. If the bumpers are set so that the bumper-blocks strike the bumper-screws before the links complete their full stroke, the links and connecting-rods stop also when the bumpers strike, but the eccentric-rod 53 continues to the full limit of' its stroke by compressing 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. When the eccentric-rod makes its backward stroke, the links and connecting-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 and compress the springs 37 of the vertical rods` and the instant the links pass their centers they and IOO IIO
the screen spring up, causing the screeni rod 57 imparts a horizontal reciprocating' movement to the screen 30, which cooperates with the vertical swinging movement et' the links, I preferably reciprocate the screen horizontally in the reverse direction to the vertical swinging movement of the links in order to reciprocate the screen in a straighter vertical line than the links raise it with their swinging strokes. Thus when the connecting-rods and links are moving in the direction of the arrow and the screen under the action of the eccentric, which is secured to the opposite side of the shaft 54C, is moving' in the direction of the arrow 84 and is pushing against the upward lilt of the links a'lter they pass their vertical centers and move upward the result is that the backward horizontal movement ot' the screen is pushing against the forward upward straight movement of the screen due to the upward swing of the links, which naturally lifts the screen upward to one side of its vertical alinemcnt.
Consequently the result of these counter movements is to litt and reciprocate the screen directly in a line at right angles to horizontal movement of screen. This compound vertical and horizontal movement gives to the screen an intensity or' vibrating motion in the directions best adapted to keep every particle of ore in intense live motion, which effectually sifts the liner particles oi" the granulated ore from the coarser particles and prevents clogging', thus enabling the screen to be Worked to its fullest capacity.
Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-
l. In a shaking-screen, a supporting-frame having brackets attached thereto, a screen supported from said brackets by springcontrolled rods and toggle-links depending from said brackets, connecting-rods operatively arranged to reciprocate saidlinks to impart a swinging vertical movement to said screen, an adjustable bumper' device comprising an adjustable bumper-head and bumper-brackets arranged partially on said supporting-frame and partly on said screen, adapted to give said screen a bump at the end of each of its upward vertical strokes, an eccentric-rod pivotally secured at one end to said screen and operatively mounted on a suitable power rotating shaft at its opposite end, a rock-shaft pivotally mounted in suitable bearings secured to said supporting-frame, rock-arms secured A at one end on said rock-shaft and pivotally connected at their opposite ends to said connecting-rods, a spring-controlled reciprocating device operatively connected at one end to said power rotating shaft and connected at its opposite end to said rock-shaft for reciprocating said rock-arms, and adapted to permit variable movement between said screen and links and having said spring-controlled rods arranged and adapted to normally hold said screen under upward vertical tension and to rcsiliently impinge said screen against said bumper' device, substantially as described.
2. ln a shaking-screen, the combination with the supporting-frame, the brackets and the links, the casing comprising the bed-plates p votally seemed to said links, the angle-irons secured to said bed-plate, and the screen and sash su p ported by said vasing, of strips adapted to rest on the side edges ol" said screen, brackets secured to one olE said angIe-ir ns at the discharge end oi' said screen, arranged to project over the adjacent ends of said side strips,` adjustable clamp-screws threaded to said arms to bear on the adjacent end ot' said clampingstri ps, a slot in the opposite end of each oi said claniiping-strips, eyes secured to the end angleirons at the opposite end of said screen, eyebolts pivotally secured to said eyes, having' nuts threaded to their ends and arranged to swingl into the slots in the ends ot' said clamping-strip and to clamp with their nuts said clamping-strips to said screen, substantially as described.
In a shaking-screen, the combination ol the supporting-trame, the bracket, the springcontrolled rods, the links and the screen pivotally supported by said rods and links, with the adjustable connecting-rods pivotally attached to said links, and comprising the yokesections connected to said links, the threaded screw-rod, secured to and adapted to adjustably connect said yoke-sections together, the rods pivotally connected at one end to the adjacent yokes, the rock-arms pivotally secured to the opposite ends of said rods, the rocksha'ft on which said rock-arm is mounted, and means for rocking said rock-shaft, substantially as described.
4. in a shaking-screen the combination with a suitable supporting-frame of brackets a1'- rang'ed on opposite sides of said frame and at predetermined distances apart, a screen suspended from said brackets adjacent toits corners, toggle-links depending from said brackets, an operative screen pivotally connected to the lower end of said toggle-links, connecting'- rods pivotally connected at one end with the central pivotal point of said links, rock-arms pivotally connected to the opposite ends oli said connecting-rods between thc pivoted centers oitl said links, and means for reciprocating said rock-arms and said connecting-rods, substantially as described.
5. ln a shaking-screen,the combination with the supporting-r' rame, the toggle-links depending from said supporting-trame, at one end, the screen secured to the depending ends ot' said toggle-links, the connecting-rods secured at one end to said toggle-links, the rock-shaft and rock-arms operatively connected to said connecting-rods, the power-shaft, an eccentric secured. on said power-shaft, a connecting-rod IIO ' f extending from said eccentric, having' its free lars and said rockarno, substantially as del end threaded, a rock-erm secured to seid roclscribed. IO shaft, an aperture in the free end of said roclr- In testimony whereof I alx my signature in arm, through which said eccentric-rodextends presence of two witnesses.
5 loosely, a nut and collar on the threaded end JOHN A. TRAYLOR.
of said eccentric-rod on each side of seid rocli- /Vitnesses: arm, and a coiled spring on said eccentric-rod G. SARGENT ELLIOTT, 'l
on each side of said rock-arm between said col- HELEN B. YOUNKIN.