US749578A - Screen. - Google Patents

Description

' PATENTED JAN.12,1901. W. E. PORTER.

N0. 74mm.

, SCREEN. AIPPLIOATION FILED MAR. 28. 1903.

N0 MODEL.

' Um STATES I Patented January il 1 904 WILLIAM E. roR'rER, orsarnromt, WES'DVIRGIN IA;

v.scm-zizw.

w.-.- I Application tiled March 28, 1903.

To Fifi/"whom; it mm?! concern:

Be itkno'wn that I, WILLIAM E. PORTER, a citizen of the United States,'residing at SandforkLin 'th'e' cou'ntyof Gilmer and State 'of -We st'Vi'rginia, have invented new and useful Improvements inScreens, of which the following is "a "specification. i

l his invention relates to screens, and more particularly to"means for vibrating a screen and regulating the extent of movement to accommodate various uses or screening different materials and also capable of being adjusted relative to the operating means to render it inactiveor' to'produce what is known as a 5 (lead-screen? The invention contemplates the screen proper havi'ng'contacting means and cam devices orivibrators and adjusting devices whereby. thesereen" proper m'ay be'moved longitu- 2 diria'lly to changethe-position of the projec= .tio'ns relativ ely to the cam devices or vibrators and positivelycontrol the degree of vibration. lhe invention'further consists in a screen proper having means for longitudinally adjusti'ngthe same,mccliarrisurfforcausing the vibration thereof, and resilient devices disposed in planes at an, angle to the position of thefscre en proper to return the latter to normal 'ij osition and acting in opposition to the 3 vibrating means.

, 'lfhe invention still further consists in the details of construction and arrangement of the several parts, whic lrwill be more fully hereinaft'er described and claimed.

the drawings, Figure 11s a vertical longitudinal section of the screen embodying the features. of the invention. Fig. '2 is a transverse vertical section on line 2' 2, Fig. 1.'

Fig. 31is'a top plan view of the screen, 'par- 4 tially broken away; and Fig. 4 is a transverse vertical section on the line' 4 4, Fig. 1.

' Similar numerals of reference are employed to indicatecorresponding parts in all figures of the drawings; 7

The numeral 1 designates a supportingframe of suitable length and comprising side rails or beams, connected at their upper ends by a cross rail or beam 2. To the upper end s mmcami; forming pm of Letters Patent No. (49,578, dated January 12, 19

Serial No. 150,010. mamas.)

that the lower ends of the rails Qwillrestupoh screen is supported. Extending transversely across the under side of the frame and menu in suitable bearings are shafts 5 and 6, having on one end of each a band pulleyr7, engaged by abelt- 8,. to render the rotation of the said shafts synchronous and on the opposite end power-belt may be applied. On the end of the shaft 6 opposite that having the pulley 7 clearly shown by Fig. 1.. lhereis a pair of these cams on each shaftlocated inside of but close to, the rails 2 of the main frame,and the projections 1) each have a gradualconvex rise terminating at an abrupt shoulder, there being I four of the proje( :tion's,,,in the, present that the form of these cam -wheels maybe varied and the dimensions thereof will be regulated proportiouately'to the remaining parts of the screen structure.

13' extend from one side rail or beam 2,130 the other.-

Hung in the frame 1 is a screen proper, comprising side rails 14 and an upper end rail 15, the lower end of the screen proper being open to permit the material screened to passfreely outward therefrom. The screen proper will have a mesh suitable for general screening for, and as clearly shown by l-ig. 4, consist of angular clips 16, secured to the side rails 2 of projecting members closely fitting under ,the

downwardly-deflected or hook ed ends 17. Se:

are angular hangers 18, having their upper adjustably receive suspending screw-bolts 19, with heads or enlargements at their lower of the frame 1 legs 4 are secured and are of erldstowhieh the upper extremities of springs 5 such length as to give proper inclination to tllO entire-screen, and it will be understoodof the shaft 5a band-pulley 9, to=which a;

thereon isafl y or balancing wheel 10. I ()nllzrcfch shafts 5 and 6 cam-wheels 11 are secured, and each has a plurality of cam projections 12, as

instance. It will be understood-,-, --.however,

the main frame and provided with inwardly cured to the side rails 14 of the screen proper 95 horizontal members projecting outwardly to .the ground or;other surface on which the At a suitable distance 'below th e positions of the cam-wheels 11 bufiers-or striking-bars,

purposes, and the suspending devices therelower edge of saidside rails and terminating in" 20 are secured, the lower ends of said spring-e Ioc= rounds the bolt.

being caught over the downwardlgdeflected or hooked ends 17 of the clips Resting on the horizontal members of the, hangers 18 are nuts 21, through which the screw-bolts l9 also pass, and the vertical ad ustment of said i screw-bolts and the tension of the springs eonnccted thereto are regulated by rotating the per rear terminal of the eyebolt 23 is screw threaded-to adjustably receive a nut 25, between which and the adjacent side of the guideplate 23 a spring 26 is interposed and sur- Secured to the underside of the screen proper are rods or small shafts 27, having rollers 28'thereon,which are always held in alinement with the cam-wheels 12, and the degree of vibration of the screen proper will depend upon the length of time the rollers 28 are permitted to contact with the projections 12 of the cam-wheels.

' The'scre'en proper is shown adjusted, for example, to obtain a normal vibrating movernerrtthereof, and in operation the projections 12 o'f thc 'cam-wheelswill successively strike the rollers 28 and push the screen proper in a downward direction or longitudinally of the main frame against the resistance of the spring 26, which will immediately retract the screen proper when the rollers clearthe maximumportions offsaid projections .and are in al'inement with the lowermost parts of-the convex edges thereof adjacent to the shoulders. There are alsealternate rise and fall movements impartedto the screen proper by the cam projectionsagainst the resistance of the springs 20, and the latter always tend to draw the screen proper downwardly when the rollers 28' are free to move behind the shoulders of v the cam projections 12. The longitudinal movements of the screen proper can be decreased by drawing upwardly on the rail 15 through the medium of the bolt 23 and nut 25, and to increase the degree of vibration of the screen the nut 25 will be loosened by turning the same outwardly to such extent as to permit the screen proper to lower, and at the same time the holts 19 will also be adjusted to permit the screen, proper to depress, and hence the vibration will be prolonged. In order to render the screen proper inactive or to produce a dcad'screen, the bolt 23 may be adjusted to such an extent as to entirely clear the rollers 28 from engagement with the camwheels;

it will be understood that when the screen is active or vibrated by the cam-wheels the side ra ls 14 thereof will be brought into force-- He inclined ful contact with the buffers 13 to pra tically shift and move the screened material down toward the end of the screen proper-and rov lieve such material of products or impurities desired to be eliminated therefrom. r I The springs 20 and 26 cause a rebound of thesrreen proper to be eii'ectcd in two directions, and while the screen impacts against the butters 13 with considerable force the latter is.to some extent reduced or absorbed, and wear and tear on the entire screen structure is lessened. I

The screen is intended for use in cleaning ore, coal, sand, or other materials, and it'will he understood that it may be provided with proper chutes for distribution of the material to. be cleaned, and, furthermore, suitable means may be employed at intervals for cleaning the screen-mesh. The power for actuating the shafts may be derived from any source, and when the screen is inactive it will beseen that rotation of the shafts will be unnecessary.

From the foregoing it will be understood also that the particular advantage in the present form of screen is that it can be moved in a longitudinal directiorr and simultaneously given rising and falling movements and that said movements are adjustable at will.

Changes in the minor details of construction may'be resorted to without departing from the spirit of the invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In adevice of the class set forth,thc combination of a frame,a screen loosely suspended therein, rollers secured to the screen adjacent opposite extremities of the latter, cam-wheels for engaging the rollers for imparting longitudinal and rising movement thereto, and a spring-controlled adjusting device loosely secured to one end of the center of the screen and operative to throw the latter out of or into engagement with the cam-wheels.

2. in a device of the class set forth, the corn- XOC hination of a rigid frame, 'a screen, adjustable spring devices for suspending the screen within the frame, rollers secured to the screen adjacent opposite extremities of the latter, camwheels for engaging the rollers for imparting longitudinal and rising movement thereto, and a a spring-controlled means loosely secured to one end of the center of the screen operative to throw the latter out ofor into engagement with the cam-wheels.

3. In a device of the class set forth, the com: bination of a frame, a screen resiliently and adjustably suspended within the frame, buft'crs rigidly held on the inner opposing sides of the frame and against which the screen normally bears, cam-wheels for engaging opposite extremities of the under portion of the screen for imparting longitudinal and rising movement thereto, and adjustable means loosely attached to one end of the screen to control the degree of movement thereof or to 'move it entirely out of engagement with the actuating mechanism to render the screen dead, the said adjustable means having springcontrolling mechanism in connection there- With.

4. In a device of the class set forth, the combination with a frame, of a screen resiliently and adjustably suspended within the frame,

cam devices engaging the under side of the screen adjacent to opposite extremities thereof to impart thereto longitudinal and vertical movement, the screen being normally disposed ata downward angle of inclination and unre- .tarded in movement at its lower end, and adjustable means loosely attached to the upper end of the frame and the screen and having a resilient mechanism cooperating therewith which always tends to pull the screen back to normal position in a longitudinal direction.

In testimony whereof I afl'ix my signature

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