US1145316A - Screen. - Google Patents

Description

0. KELLY.

USCREEN.

APPLICATION FILED JUNE 6. I9I4.

1,145,316. y Patented my 6,1915.

' 2 SHEETS-s115211.

DUDE

0. KELLY.

SCREEN.

APPLICATION FILED IuIIE s. 15H4.r

Famed July 6,1915.

2 SHEETS-SHEET 2.

Attorneys ics.

. ORIN KELLY, OF-ATHENS, OHIO.

To all whom it may concern.'

Be it knownthat I, ORIN KELLY, a citizen of the United States, residing at Athens, in the county of Athens and State of Ohio, have invented a new and useful Screen, of which the following is a specification.

The device forming the subject matter of this applicationis adapted to be employed for screening materials of any sort, but to avoid unnecessary repetition hereinafter, it will be presupposed that the structure is employed in handling coal.

One object of the present invention is to provide a novel arrangement of screens or chutes, whereby the material may be graded according to its size, it being possible to make up combinations comprising the various sizes of graded material.

Another object of the invention is to provide a means whereby the material may be made to travel along a screen or chute which is horizontally disposed, this operation beving brought `about by so proportioning a crank arm on a driving shaft and a-rod connected therewith, that the rod, and consequently the screen will travel at different speeds at the ends of its stroke.

Another object of the invention is to provide a device of this type \in which the screens may be built in pairs and arranged to balance each other, thus reducing the shock, and rendering unnecessary, costly and massive foundations.

Another object of the invention is to provide Y a device of this type in which the screens may be given different leverages upon a rock arm, thereby permitting one screen to be heavier thanvthe other without causing undue shock inthe operation of the structure.

It is within the scope of the invention to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

'IVith the above and other objects in view which -will appear as the description proceeds, the invention `resides in the combina,- tion and arrangement of parts.and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within' the scope of what is claimed without departing from the-spirit of the invention.

In the accompanying drawing z-Figure 1 is a side elevation showing one form of the SCREEN. y

1,145,316. specification of Letters Patent. Patented July 6, 1915, Application inea June s, 1914.` senai N'o. 843,494. f

invention; Fig. 2 is a longitudinal section of the structure shown in Fig. 1; Fig. 3 is a top plan of the struc-ture shown in Fig. 1;

Fig. 4 1s a cross section on the line 4--1 of- Fig. 2;.Figy5 is a cross section on the line o-'o ot Fig. 2; Fig. 6 1s a top plan showing a portion of one of the driving means whereby the screens are actuated; Fig. 7 is a vertical longitudinal section showing the mechanism depicted in Fig. 6; Fig. 8 is a top plan showing a modified form of driving mechanism; Fig. 9 is a side elevation of the structure shown in Fig. 8; Fig. 10 is a side elevation showing a. still further Inodication in the driving mechanism; Fig. l1 is a side elevation showing a modified form of driving mechanism; Fig. 12 is a diagram referredto in connection with the operation of the structure;'Fig. 13 is a fragmental top plan of one screen; Fig. 14 is a section on the line 1%-14 of Fig. 13.

In carrying out the present invention and referring particularly to Figs. 1, 2and 4 there is provided an upper chute 1 and a lowerchute 2 mounted to reciprocate in the direction of their lengths. These chutes may be supported for reciprocating movement infamy, desired manner, but in the present instance and by way of illustration overhead supports 3 are shown, hangers 4: being employed for suspending the upper chute 1 from the supports 3,hangers"5 eX- ercising a like function with pspe'ct to the lower' chute 2. f

The bottom of the upper chute 1 is divided into a plurality of sections, the number, of sections being regulated by the number of grades into which it is desired to separate the material. In the present instance, the bottom of the upper chute l is depicted as comprising sections 6, 7 and 8. Gpenin'gs 9 are formed in the section 6, the section 7 is provided with openings 10 and there are openings 11 in the section 8. The openings 1l are the largest, the openings 9 are the smallest, and the openings 10 in size lie intermediate the openings 9 and l1.

In fashioning the openings 9, 10 and 11,i

inclined tongues l2 are struck from the bottom of the upper chute 1, las will be clearly understood from Figs.' l3and 14. Upon the back jerk of the upper chute 1,'the coal or other material which is too large to pass through the respective openings, slides up the inclined tongues 12. This construction prevents the material from wedging in the openings, reduces to a minimum the breakage on the screen or coal, and by permitting a free passage of the chute, reduces the power necessary to drive the chute. i Y

Extended longitudinally of the lower chute 2 is a screen 14 of comparatively finel mesh, so that no coarser7 material can pass through the screen 14 than passes through the smallest openings 9 in the upper chute 1. 30 Below the screen 14, the chute 2 is provided with longitudinally extended, troughshaped pocket 15. At intervals, the pocket is iutersected by transverse spouts 16 and 17, there being openings in the screen 14 15 above the spouts 16 and 17, these openings being controlled by valves 18 and 19, actuated by any suitable means indicated at 20. Extended across the lower chute 2 is' an imperforate baffle plate 21. The baiiie plate 20 21 at one end extends above the spout 16,

and theV other end of the bale plate termi-A nates adjacent the first of the openings 10. A baflie plate 22 is similarly mounted in the lowerchute 2 and is located in a corresponda5 ing relation with respect to the spout 17 and the-openings 11.

yThe numeral23 indicates a supply bin of any desired' sort beneath which reciprocates, upon a track 25, if desired, a feeder 24. Any' suitable means may be provided for reciprocating the feeder 24 but in the present instance the same is shown as operated 4through the medium lof a pitman 26 pivoted to a crank arm 27 formed upon one end of a 3 5 shaft 28.`

' Presupposing that the device is to be emr ployed for handling coal, the coal, mixedl and of various sizes, is delivered-onto the,

section 6 of the upper chute 1, through the instrumentality of the feeder 24. The slack or coal of smallest diameter, passes through the openings 9 in the section 6 and drops into .the slack pocket l5 and onto the bafie plate 21, from which the slack ultimately finds its Way into the pocket 15. As the 'lower chute 2 is reciprocated, the slack coal moves to the left and runs offl the left hand .end of the pocket 15.

The nut coal, which is the next largest size passes through the openings 10 in thev section 7 of the upper chute and drops onto the screen 14 or onto the baie plate 22. Anyslack produced by the passage of the coal over the sections 6 and 7 of the upper chute passes through the screen 14 into the pocket 15 and mingles with the slack which originally passed through the openings 9 in the section 6 and through the left hand end of the screen 14. The nut coal travels to the left along the screen 14, and ultimately is received by the spout 16. The egg coal passes through the openings 11 in the section 8 ofthe upper chute and moves to the left along the screen 14, the egg coal being @5 received-by the spout 17. The lump coal which isthe largest size passes off the right hand end of the upper chute 1.-

Obviously, any desired mixture may be effected by manipulating the valves 18. The

function of the baflie plate 21 is to prevent the slack coal passing through the section 6, from mingling with the nut coal which is moving to the left along the screen l4,.the fbaflle plate 22 exercising a similar function with respect to the nut coal passing through 2 but as will be set forth hereinafter the coal may be made to travel tothe right along the lower chute 2i No matter how the coal travels upon the respective 'chutes 1 e@ and 2, these chutes move in opposite directlons and tend to' balance each other.j.r

I will now describe 'the various means whereby a reciprocating or 'shaking'.'move-- ment may be imparted to the chutesland '2, $35

ln the drawings, base frames i.29 are shown, supporting for rotation a shaft 30. rlhe shaft 30 may be connected operatively with the shaft 28 in any suitablemanner. In the present instance, the shaft 30 is shown as provided with a pulley 31 about which is trained a belt 32 passed around a pulley 33 on the shaft 28, although the showing of the drawings in this regard'is illustrative merely. The shaft 30 is pro- 10 vided with cranks 34 whichl project in a common direction, and with each crank 34 is assembled a short link 35, pivoted to a finger 3G projecting from a rock arm 37 mounted on a frame supported shaft 38. H The rock arm 37 is provided with a plurality of openings 39 in any .of which may be placed pivot elements 40 united with connccting rods 41 and 42, the connecting rods 41 leading to the upper chute 1 and the conl necting rods 42 leading to the lower chute 2.

In Figs. Sand 9, a shaft 44 is'journaled 'l in suitable bearings 43 and is provided, in lieu of the crank 34, withthe cranks 45 disposed at an angleofdegrees with re- 15 spect to each other, the cran'ks45 being connected through the medium of short links 46 with a rock armcomprisin-g'angularly disposed parts 47 mounted at their lower ends to swing upon a supporting shaft 48, 15

`the connecting rods which lead to the chutes or screens being denoted by the numeral 49. As shown in Fig; 10, the driveshaft is `depicted at 50, the crank thereon at 51, the

short\\link being shown at 52. The rockarm l 53 is pivoted intermediate its ends as shown at 5e and the connecting rods which lead to the chutes or screens are shown at 55.

In Fig. 11, the drive shaft is shown at 56 and carries an 'eccentric 57 surrounded by a strap 58 pivoted at 59 toa rock arm 60 supported for swinging movement yintermediate its ends as shown at 61, the connecting rods being shown at 62.

As a. general statement of operation, the device shown in Fig. 7 being taken as typical, it will be understood' that when the shaft 30 is rotated, the crank 34, through the medium of the link 'will swing the rock arm 37 to-and fro, the connecting rods 41 and 42 causing the chutes or screens 1 and 2 to move in opposite directions. This general statement of o-peration is applicable to the other forms depicted, but sundry points of importance should be notedf at this place.

In Fig. 12, the operation of the device is shown diagrammatically and this diagram will be applied to Fig. 10 by way of illustration, ysince it is in Fig. 10 thatthe simplest form. of the invention is shown.

Suppose that the line AB representsithe crank 51, that the line AC represents the link 52, that the length of the crank '51 is six inches, and that the length of the link 52 is twelve inches. Then the length of the line BC is approximately ten inches. When the crank has moved through the first quadrant and has assumed the position BE, the link will assume the position ED, the length of the line BD being eighteen inches and the outer end of the link having moved through a distance of eight inches, represented by the length of theline CD. As the crank moves through the second quadrant and assumes the position BF, the outer end of the link will have moved through a dipstance of eight inches, represented by the line DC. As thecrank moves through the third quadrant and assumes the position BG, the outer end of the link will have moved through the distance CE, or approximately four inches. When the crank moves through the fourth quadrant to the position AB, the outer end of the link will have moved through the distance EC or approximately at the time the crank assumes the position l BE is greater than the momentum of the coal in the direction of the arrow Y at the time the crank assumes the position BG.

Consequently, the coal will be advanced in the direction of thearrow X, even though the screens or chutes set level or assume a slight upward inclination.

i If C represents the length of the crank and L represents the length of the link, it

lwill be seen that the operation above described takes place with maximum efiiciency lengths of the crank and the link approach the following proportion C L=1 1.

I The speed of advance ofthe coal along the chute or screen may be regulated by adjusting the relative lengths of the crank and the link but, in any event, the link should be relatively short, compared with the crank.

The eccentric construction shown in Fig.l

`Figs. 8 and 9 is resorted to, the coal will move in the same direction onboth screens.

.The principle involved consists -in transforming the angular motion of a crank or eccentric into a lineal motion through the instrumentality of a rock arm, with theaddition of a relatively short `link when the crank isemployed instead ofthe eccentric.

In practice, the screens or chutes 1 and 2 are seldom of the same weight, the lower screen or chute being usually lighter than the upper one. In order to secure a perfect counter balancing of the screens or chutes, so as to reduce the shocks on a supporting 'structure to a minimum, it is necessary that the momentum of the moving screens should be as nearly equal as possible. If the lower screen is lighter than the upper screen and, if the momemtums of the screens are to be approximately the same, it is obvious that the speed of reciprocation of the lower screen must be greater than the speed of reciprocation of the upper screen, since the.

momentumis the' product of the weight, and the speed. It is to accomplish this result that the rock arm 37 is rovided with a plurality of openings 39, 1t being possible to regulate and ad]ust the relative speeds vwhen, as in the present case, the'relative of thetwo screens by mounting the pivot elements 40 res activelyA in the proper openings 39. Flirt er, the lower screen generally'should be run at' a higher shaking speed than the upper screen, because the lower screen usually carries the finer grades of coal.

The invention includes, essentially, a rock arm as 37 or 60, the reciprocating screens or chutes 1 and 2, connections, indxcatedat 41 and 42 or at 62 between the screens and the rock arm, a connection pivoted to the rock arm, the connectionbeing in the form CII of the strap 58 or the link 35, a shaft such as 56 or 30, and an eccentric element carried by the shaft, the eccentric element being of the form shown at 57 in Fig. 11, or consisting of the crank 34, the eccentric element, whatever be its form, being movably united with ,the connection, represented by such an element as 57 or 35.

Having thus described the invention, what is claimed is 1. In a device of the class described, vertically alined upper and lower chutes mounted for individual longitudinal reciprocation, the upper chute comprising sections having, respectively, openings of different sizes; a screen extended longitudinally of the lowerchute and lying beneath both sections of the upper chute; an outlet spaced from the bottom of the lower chute,

and intersecting the screen intermediate the ends of the screen; and a baille in the lower chute and located above the screen, the baille overhangingthe outlet and terminating adjacent the outlet.

2. In a device of the class described, vertically alined upper and lower chutes mounted for individual longitudinal reciprocation, the upper chute comprising sec tions having, respectively, openings of dii"- amsie ferent sizes; a screen extended longitudinally of the lower chute and lying beneath both sections of the upper chute; an outlet spaced from the bottom of the lower chute and intersecting the screen intermediate the ends of the screen; a baille in the lower chute and located above the screen, the baille overhanging the outlet and terminating adjacent the outlet; and a valve operating in the lower chute and constituting a means for bridging the outlet.

3. In a device of the 'class described, a support; a rock arm mounted to swing thereon; means for actuating the rock arm; superposed screens; and means for connecting the screens with the rock arm at adjusted points along the rock arm, thereby to adjust the relative lineal speeds of rthe screens and to equalize the momentums of the screens when the same are of different Weights.

In testimony that I claim the foregoing as my own, l have hereto affixed my signature in the presence of two witnesses.

C. W. Gnoss, l R. R. JOHNSON.

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