US2124475A - Screen chute - Google Patents

Description

July 19,1938.

' A. SMITH ET. AL

SCREEN CHUTE Filed Aug. 19, 1955 2 Sheets-Sheet l [N VE/V ToRs:

Hrch/bo/o L 5/77/77),

July 19, 1938.

A. L. SMITH ET AL SCREEN CHUTE Filed Aug. 19, 1935 2 Shegts-Sheet 2 Patented July 19, 1938 r UNITED STATES PATENT OFFICE SCREEN CHUTE Archibald L. Smith and Francis E. McGovern, Columbus; Ohio, assignors to The Jefirey Manufacturing Company, a. corporation of Ohio Application August 19, 1935, Serial No.36,817

10 Claims. (01. 209-399)' This invention relates to screen chutes, parbe directed by the valve I1 .into the discharge ticularly of the type adapted to be employed to chute I and to the guide spout I6, by which screen coal to size as employed in a coal tipple. they may be guided into a car in a manner well An object of the invention is to provide a known to those familiar with tipple practice. 5 chute having a screen made up of removable sec- By closing the gate valve I1, the material tions which are simple and rugged in construcpassing through the screen I3 forward thereof tion, which screen sections may be readily remay be passed on down the chute l8 and released moved and replaced by other sections having difwith material which passesthrough the screen ferent size screen openings therein. I3 below said gate valve II. In general practice,

Another object of the invention is to provide the screen sections I4 of the screen I3, which a chute in which removable screen sections of are positioned above the gate valve II, will have widely varying lengths may be employed. relatively small openings therein whereby only Other objects of the invention will appear relatively fine material will pass therethrough.

hereinafter, the novel features and combinations The screen sections I4, positioned below the being set forth in the appended claims. gate valve II, will have larger openings therein 1 In the accompanying drawings: whereby larger size coal particles may pass there- Fig. 1 is a side elevational view of a screen through. Any number of screen sections with chute comprising my invention; different size openings may be provided to screen Fig. 2 is an end sectional view taken on the selectively and progressively the material which line 2--2 of Fig. 1; passes down said screen I3.

Fig. 3 is an enlarged side view showing the One of the principal features of our invention mounting of a screen section; resides in the construction of the screen sections Fig. 4 is a perspective view of a screen section; I4 and the co-operating supporting means there- Fig. 5 is a side elevational view of a shaker for, whereby said screen sections I4 may be type of screen chute comprising my invention; readily removed to the end that screen sections 2 Fig. 6 is an enlarged detail side view of a porhaving different size perforations may be substition of the chute of Fig. 5 showing particularl tuted therefor, thereby providing a ready conthe mounting of the screen sections; trol of the size of material received by the chute Fig. 7 is a sectional end view on the line I5.

1-1 of Fig. 6;

Fig. 8 is a side view of a portion of the screen the chute I8 comprises the side walls I8, I8 and a chute showing the construction of a lip type of closed or imperforate bottom wall I9. The botscreen section; tom wall I9 is provided with an appropriate open- Fig. 9 is a sectional end view of a modified ing leading to the auxiliary discharge chute I5, form of screen chute; and which opening is controlled by the gate valve I! Fig. 10 is an enlarged side view showing a depivoted to shaft I1 and operable by hand lever tail of the device of Fig. 9. I8 to open-or closed position where it may be Referring particularly to the drawings, there locked to brackets I9 or 28', respectively, by a is seen a chute I 0 which is adapted to receive removable bolt and nut. In the closed position, material, such as coal, from a conveyor II, which the free edge of valve rests on the ledge 2|. may be a belt conveyor, the coal. being directed Extending along a straight line longitudinally to the chute I0 by an auxiliary chute I2. The ,of the chute I8 and adjacent the side walls I8, I8, chute I8 is provided with a screen |3 which may there extends a pair of spaced rails 28, 28, which be made up of a plurality of screen sections I4, are rigidly attached to said side walls I8, I8 by which screen sections I4 are removably and interrivets 2|, 2|. Appropriate spacers 22, 22 are changeably carried in the chute I0. provided through which the shafts of the rivets Adjacent the bottom of the chute I8 may be 2|, 2| extend, whereby the rails 28, 28 will .be one or more auxiliary discharge chutes I5 which spaced from said side walls I8, I8 while being lead to a guide spout I6. An adjustable gate heldrigidly therewith.

valve I! may be provided to direct material which The construction of the screen sections I4 is passes through the screen I3 forward of the best seen in Figs. 2, 3 and 4 of the drawings. discharge chute I5 into said discharge chute. Said sections comprise a perforate bottom plate It will thus be evident that as coal is fed to the 23 having adjacent each side edge a longitudichute ID the particles thereof, which are able nally and upwardly extending flange 24., 'Said to pass through the apertures of screen I3, may flanges 24 are provided to lendrigidity to the Asbest seen in Figs. 1 and 2 of the drawings, P

Adjacent each corner, the bottom plate 23 is' provided with a downwardly extending leg 26 which is notched at 2'! to receive the spacer 22 about rivet 2!. The longitudinal axis of the slot 21 preferably forms a slight angle to the vertical,

whereby said axis will be substantially vertical when positioned on the sloping chute I0.

As best seen in Fig. 3 of the drawings, theslot 21 is cut to such a depth that the metal adja cent the bottom portion thereof does not contact 7 with a spacer 22. In other words, the bottom plate 23 will ride on the rails 20 rather than permit the riding of the legs 26 on the spacers 22. This will insure a maximum bearing area for supporting the screen sections 14 and will prevent unduewearing of spacers 22 or slots 2! in legs 26. It will be evident that the function of the slotted legs 26 is to position and holdscreen sections 14 in the chute l9.

' It is to be noted that the rivets 2| are equally spaced along the chute l9 whereby screen sections M of different lengths may be employed in which the distance between the slots 21 is a multiple of the distance between the axes of adjacent rivets 2|. That is, a screen section 14 may have any desired length, the only requirement being that the legs 26 be so positioned that the slots 21 are spaced a distance which is a multiple of the distance between the axes of adjacent rivets 2!. This permits any screen section to be used in any trough made to these standards.

It is thus evident that a device is provided in which a screen l3 may be made up of a variable number of screen sections I4, which screen sections l4 may be readily removed and replaced either for the purpose of varying the effective size of the openings in the complete screen l3 or for any other purpose.

As is seen from Fig. 1 of the drawings, there is preferably positioned above the opening which leads to auxiliary discharge chute l5 a section of the screen l3 which is not perforated This section is indicated at 23 and forms a dividing point in the screen l3 between the portion which is adapted to feed the auxiliary dischargechute l5 and the portion which feeds a subsequent, similar chute. 7

Reviewing briefly the mode of operation of our invention of Fig. 1, coal will be fed to the chute from the conveyor 1 l. The screen I 3 will have sections [4 with relatively small openings therein extendingto the plate 28. Relatively fine coal will thus pass through theupper portion of the screen l3 and may be directed by gate valve I! to the auxiliary discharge chute l5, from which it is received by the guide spout l6 and loaded onto a car. The subsequent screen sections I4 of the screen I 3 below the plate 28 may have largesize openings to effect a further screening operation on the coal. The size of the openings in the. screen l3 may be effectively varied, as desired, by removing the sections l4 and substituting other sections having different size openings in the bottom plates 23 thereof.

In Fig. we have shown a modified form of our inventionincorporating a shaking screen 30 having a pair of spaced side plates 3| connected together by a transversely extending bottom plate 32 to form a trough. The shaking screen 30 is suspended on framework 33 by appropriate pivoted hangers 36 which allow vibratory movement of said shaking screen 39 with respect to said framework 33. Vibratory movement of said shaking screen 39 is provided by an eccentric mechanism 35 which may be 'driven'froi'n a motor 33 by any appropriate driving means, such as belt 31.

1 A plurality of screen sections 38 is provided which may be of the general structure of the screen sections M illustrated in Fig. 4 except for such differences as will be hereinafter specifically pointed out. Said screen sections 38 differ from said screen sections i in that in place of the downwardly extending legs we provide downwardly extending pins 39 having frusto-conical points 33.

As best seen in Fig. 5 of the drawingsthe axis of the pins 39 make an acute angle with the plane of the screen sections 38and are preferably. substantially vertical. This construction tends to insure against displacement of the screen sections 38 with respect to the shaking screen 30. We also contemplate a structure in which the axis of the pins 39 is at right angles to the plane of the screen section'38.

For supporting the screen sections 38 in the shaking screen 39, we provide a plurality of longitudinally extending angle members 4!, one ad-. jaccnt each side plate 3|, the vertical flanges of which are rigidly attached to said plates 3|, as by welding. Said angle members 4| are provided with apertures 42 to receive the pins 39. Due to the fact that the pins 39 extend through said apertures at an acute angle to the top web of the angle members M, the apertures 42 are slightly larger than the pins 39. -This construction would result in some looseness of the screen sec tions 38 on the angle members 4| which would result in undue wear of the pins 39. To provide a closer fit for the pins 39 to prevent relative movement between said screen sections 38 and the shaking screen 39, we provide a plurality of apertured brackets 43, one for each of the pins 39, which are rigidly attached to the angle members 4!, as by welding, and which have apertures 44 adapted to provide a relatively close fit with the pins 39. 5

Where the pins 39 are made perpendicular to the plane of the screen sections 38, the apertures 42 may be made smaller so that said pins 39 fit closely therein, under which; conditions the brackets 43 may be eliminated.

It is to be distinctly understood that the con struction of the screen sections 38, illustrated in Fig. 5, and the construction of the shaking screen 33, of said Fig. 5, may be employed as a stationary screen, as illustrated in Fig. 1. I

It is also to be distinctly understood that the stationary screen of Fig. l and the construction of said screen sections l4 of Figs, 1, 2, 3 and 4 may be mounted as a shaking screen, as illustrated in Fig. 5.

In addition to the elements previously described in Fig. 5, we also provide a feed chute 45 for feeding material to the shaking screen 30 and two discharge chutes 43 and 41, respectively, the former of which discharges material from the screen 39 which does not pass through perfora tions in the screen sections 38 and the latter of which discharges the material which does pass through said perforations.

illustrated" in Fig. 5 of the drawings, the perforated-bottom plates of the screen sections 38 are flat. This construction is by nomeans necessa-ry and in Figs. 6, 7 and 8 we-have illustrated bottom plates 48 which extend between apair of longitudinally extending side straps 4 8 and are rigidly attached thereto, as by welding. Said bottom plates '48 are also provided with lips 49. This lip construction is sometimes preferred for its aids the movement of the material along the screen; It will, of course, be evident that the screen sections M of Fig.- 4 may also be provided with a lip type of bottom plate in place of the flat bottom plate 23.

In Figs. 9 and 10, there is illustrated another form of screen chute which may either be the stationary or shaking screen type. This chute comprises side walls 50 and the usual bottom wall similar to bottom wall l9 of Fig. 1 and 32 of Fig. 5, which is not shown.

At spaced intervals along the side walls 5!], we provide transversely extending angle members 5|. which are welded at their ends to the side walls 50. The top flange 52 of said angle members 5| is provided with spaced perforations 53 adapted to receive the pins 39 of the screen sections 38. It may be noted that, as illustrated in Fig. 10, the pins 39 are perpendicular to the plane of the screen sections 38. When this construction is employed, brackets, similar to the brackets 43 of Figs. 6, '7 and 8, may be omitted.

The angle members 5| have a stifiening eifect upon the side walls 50 of the screen which, of course, is not present in the other forms of the invention.

The operation of the device of Fig. 5 is, in general, the same regardless of the exact structure thereof as illustrated by the several modificationsin Figs. 6, 7, 8, 9 and 10, and may be briefly described as follows:

Material, such as coal to be sized, is fed to the chute 45. The shaking screen 30 will be oscillated from the eccentric mechanism 35 operated by motor 36. As material is fed to said shaking screen 30, those particles which are smaller than the apertures in the bottom sections of the screen 38 will pass therethrough and flow along the bottom wall 32 of said shaking screen 30 to be discharged by the discharge chute 41. Those material particles which are larger than the apertures in the bottom plates of screen sections 38 will pass over said screen sections 38 and be discharged from chute 46. It will be evident that the screen sections 38 will be rigidly held in place though they may be very readily removed to be replaced by other similar screen sections which may have different size apertures in the bottom plates thereof.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and we wish therefore not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of our invention, what we desire to secure by Letters Patent of the United States is:

1. In a chute, the combination with a trough having side walls, of rails positioned adjacent said side walls and extending longitudinally thereof, means for spacing and supporting said rails inwardly of said trough side walls comprising a plurality of equally spaced rivets, and a plurality of separately removable screen sections of'diflerent lengths and interchangeably mounted on said trough,'each having upwardly extending side flangesand downwardly-extending legs, said legs having notches received by said rivets, said sections having perforated bottoms resting' on said rails. I i i '2. In a chute, the combination with a trough having side walls, of rails positioned adjacent said side walls and extending longitudinally thereof, means for spacing and supporting said rails inwardlyof said trough side walls comprising a plurality of equally spaced rivets, and a plurality of separately removable screen sections of difierent length, each having downwardly extending legs, said legs having notches received by said rivets.

3. In a chute, the combination with a trough having side walls, of a rail positioned adjacent a side wall and extending longitudinally thereof, equally spaced rivets passing through said side wall and said rail, spacing means about said rivets between said rail and side wall, and a screen section supported by said rail and having downwardly extending legs notched and receiving said spacing means, said notch being of such depth that the leg portion forming the bottom thereof is out of contact with said spacing means.

4. In a chute, the combination with a trough having side walls, of a rail positioned adjacent a side wall and extending longitudinally thereof, securing means adapted to pass through said side wall and said rail, spacing means about said securing means between said rail and side wall, and a screen section supported by said rail and having downwardly extending legs positioned adjacent said spacing means, said legs being constructed and arranged so as to prevent longitudinal movement of said screen section relative to said trough without carrying the vertical load on said screen.

5. In a chute, the combination with a trough having side walls, of a rail positioned adjacent a side wall and extending longitudinally thereof, equally spaced rivets passing through said side wall and said rail, spacing meansabout said rivets between said rail and side wall, and a plurality of separately removable screen sections of different lengths supported by said rails and each having downwardly extending legs notched and receiving said spacing means.

6. A screen section for a multiple section screen comprising a perforated metal bottom plate having upwardly extending longitudinal side flanges, and short substantially equi-length downwardly extending legs adjacent each end of said section and along each side thereof, said legs having downwardly opening retaining notches therein adapted to lock said section;

7. A screen section for a multiple section screen comprising a perforated bottom plate having upright longitudinal side flanges, and four downmembers; and angle clips attached to said side walls and having apertures cooperating with said pins to prevent sliding movement between said sections and said trough.

9.'In a chute, the combination with a trough having side walls, of a rail positioned adjacent a side wall and extending longitudinally thereof, spaced rivets passing through said side wall and said rail, spacing means about said rivets between said rail and side wall, and a screen section supported by said rail and having downwardly extending legs notched and receiving said

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