USRE21318E - Drive mechanism fob shaker - Google Patents

Description

Jan. 9, 1940. w. w. SLOANE DRIVE MECHANISM FOR- SHAKER CONVEYERS ori inal Filed Nqv. 28, 1952 3 Sheets-Sheet l [Hi/[mm wJ/omc Jan. 9, 1940. w. w. SLOANE 21,313

DRI VE MECHANI SM FOR SHAKER CONVEYERS Original Filed Nov. 28, 1932 3 Sheets-Sheet 2 Jan. 9, 1940. w, w S AgE Re. 21,318

DRIVE MECHANISM FOR SHAKER GONVEYERS Original Filed Nov. 28, 1932 '3 Sheets-Sheet 3 J1? ye]? Millie/W l/ Jjocme UNITED STATES Reissued Jan. 9, 1 940 DRIVE MECHANISM-FOR SHAKE CONVEY-ERS William W. Sloane, Chicago, n1 assignor m Goodman Manufacturing Company, Chicago, 111., a corporation of Illinois Original No. 2,026,103, dated December 31, 1935,

Serial No. 644,666,v November 28, 1932. Renewed June 3, 1935. Reissue No. 20,589, dated December 14, 1937, .SerialNo. 172,296, November 1, 1937. This application for reissue June 2, 1939, Serial No. 277,119

19 Claims.

This invention relates to improvements in drive mechanisms for shaker conveyers of the type utilized for conveying loose material, such as coal.

Among the objects of my invention are to provide an improved construction and arrangement of the shaker drive whereby minimum head space or vertical clearance is required, and wherein a portion of the intermediate drive mechanism extends beneath the shaker trough, and re-, ciprocating motion may be transmitted to 'th & shaker trough in a vertical plane including the longitudinal axis of said trough.

A further and important object of my invention is to provide an improved mechanical movement for drive mechanisms of the character described, whereby a plurality of power transmlt.

ting devices are interposed between the drive motor and the trough, and arranged to transpose the rotary motion produced by the motor into a,

rectilinear motion having predetermined changes in acceleration during various parts of its stroke so as to produce a most efficient jigging action for moving loose material in one direction along the conveyer trough. As will hereinafter more line 2-2 of Figure 1;

fully appear, my improved form of mechanical motion is based primarily upon certain novel principles of arrangement and relationship of bell crank members and connecting links, which' 3 principles are capable of application ina Wide variety of forms not necessarily limited to the specific form of shaker trough illustrated herein.

In the design of shaker conveyer driving mechanism, it is often possible to increase the movement, of the material along the pan line by increasing the maximum forces that are applied to the pan line and to the various parts of the driving mechanism. It is, of course, desirable that the material be moved as rapidly as possible and at the same time the stresses be kept to a minimum. Accordingly, another of the principal objects of my invention is to provide a drive mechanism of the character described which will move material faster than other drive mechanlsms in proportion to the stresses created.

The invention may best be understood by reference to the accompanying drawings in which:,

Figure 1 is a top plan view of one embodiment of my invention with parts of theshaker trough and gear case cover removed, and parts broken away to show certain features of construction of] the main operating parts;

a Figure 2 is a transverse section taken alongv linkage embodying the principle of my improved form of mechanical'movement, with the parts arranged as in the shaking mechanism shown in Figure 1. 1

Referring now to the details of the embodiment of my invention illustrated in the drawings, and; relating particularly to the details of construction wherein an especially compact and simple shaker drive is provided and overhead clearance is reduced to a minimum, my improved form of drive consists of a casing l which is adapted to rest on the mine floor and be suitably secured thereto when in operation by holding jacks (notshown) or the like in the usual manner.. The casing 10 consists of a main housing 12 adapted to be positioned at oneside of a conveyer trough II and having a reduced laterally extending portion 13 adapted to-extend beneath said trough and beyond the center line thereof, as clearly shown in Figures 1 and 2.

I A motor I is mounted on one of the walls of the drive casing. The motor [5 may be of any type, butin the form shown an electric motor is employed having an armature shaft 16 and drive pinion l'l thereon meshed with a gear i8 herein rotatable upon a vertically disposed shaft 19 supported at its upper andlower ends in antifriction bearing supports 20 and 2 I, respectively. A pinion 22 is keyed on the shaft I9 and drives a spur gear 23 on an upright crank shaft 24 having anti-friction bearing supports 25, 25 at the upper and lower ends thereof, as shown.

The crank shaft 24 has a crank arm 27 to which is connected a horizontally disposed connecting rod 28 having its opposite end pivoted on a lever arm 29 forming part of a bell crank member '30.-

' second bell crank tioned arm but extending generally toward side where the troughis mounted.

A second connecting link 34; is pivoted on the end of the lever arm 33" and extends" horizontally into the reduced extension of the casing Ill beneath the trough H where it is connected to an-- arm 35 of a second bell crank member 36. ,This

member 36 is pivoted on apin It will be especially noted, aso ne of the features of my improved form of mechanical move ment, that the a is of the first bell crank member'- 36 is disposed at one side of. the extendedaxis of the second connecting link 34', while. the axis of rotation of the second bell ficrank member 36 is disposed on'the opposite "sid'eof the extended axis of .said second connecting link. The pur-;

pose of this particular construction will here-' inafter more fully appear in the detail discussion of the mechanical movement and its various modifications.

A second arm 39 of the second bell crank member 36 extends at a substantial angle to its companion arm and toward the center line of the trough. The second arm" 39 of the second bell crank member 36 is connected at its free end to a double: hinged'lirik 40, which in turn is pivotally connected to a plunger 4| extending through .an'elongated guide'bearing 43 disposed in a horizontal axis but in a vertical plane which also includes the longitudinal axis'of the trough H. The trough is finally connected to the outer endofthe plunger by means of a double hinged link 44 having connection with a suitable bracket 45 mounted on the undersurface of said trough, as shown in Figures 1 and 4.

As a preferred feature of construction to provide ready accessibility to the operating parts within thecasing Ill, it will be observed that I split said casing upon a horizontalline intertendingflange supports 48, 48 at opposite sides secting the axis of the driving motor where its armature shaft l fi-extends into'said casing, as clearly shown. in 'Figure 3. A, bottom part 41 of the casing l0 has a plurality of inwardly exthereof, upon which are mounted an upwardly arched bracket'49 which carries theupper bearing supports 2| and 25 of the shaft I9 and the crank shaft 24, respectively. arched bracket 49 is suitably secured to porting flanges 4B asby bolts 50; 50'.

I also provide a detachable bridge member 5| secured to the supporting flanges 48 between the vertical walls of the upwardly arched bracket 49 the sup- 1 and secured by bolts 53, 53, as shown in Figure 2,

which carries the bell crank member 30.

The bridge member 5| carries the lower bearingv support 2i) of the upright shaft I 9, and also has a downwardly extending portion. 54 whichforms the upper bearing support for the upright pin 3| An upper partor cover 55 of the casing I0 is detach.- ably connected to the bottom part 41 by cap screws 55, 56., i

With the construction described, it will be observed that after the cover ,55- is removed, the upwardly arched-bracket 49 may be bodily removed with its bearing supports 2| and 25 and the bridge member 5| may then be removed in a similar manner so as to permit removal of'all.

of the operating parts containedwithin the main part of the casing I'll,

Referring now more particularly to the novel form and advantages of the specific arrangement ofpower transmission mechanism, thejizlinkage employed the embodiment?" 1ustrated in Fig:

The upwardlythe ures l, 2, 3, and 4 is shown in diagrammatic form in Figures 5 and 6. stoodthat in order to efficiently move coal or material along the conveyor trough the 'drivin'g mechanism must impart to said conveyer trough a forward stroke gradually accelerated for a greater part of its length, andrapidly decelerated for the remainder of its length; and a back stroke correspondingly but reversely rapidly accelerated for a relatively short portion of its length and gradually decelerated for the remainderof its length. It should further be understood that it is desirable that the acceleration. in the forward stroke, and the combined deceleration in the forward stroke and accelerationin the return stroke, be as uniform as possible in order to get the greatest coal movement in proportion to the maximum accelerating force, it being understood that where the rates of acceleration and deceleration are uniform,

the forces of acceleration and deceleration will be uniform When'theconveyer pan line is on a'relatively' level plane, in order that material may be moved along said conveyer pan line, it is necessary that the force of acceleration per unit of weight on the forward stroke be less than the force of deceleration per unit of weight at the" other end of the forward stroke andthe force of acceleration on the start of the return stroke.

terial to be moved lie somewhere between-the values of these unit forces or a little less than.

the lesser force. I

Furthermore, in order that a driving mechanism may be capable of handling material, the coefficient of friction of which may vary from time to time, and in order that movement of the material be not too greatly affected by moderate changes in speed of the drive motor or by different grades in different portions of the pan line,

it is desirable that the difference between the forces of. acceleration on theforward stroke and the. forces of deceleration at the other end of the: forward: stroke and the forces of accelerationv at the start of the return stroke be sufilcient that the lower unit force; that is, the force of acceleration of the forward stroke be below the. coeflicient of friction, of the'material, and the maximum force; that is, the force of deceleration at the other end of theforwa-rdstrokeand the force of acceleration at the start of the return stroke be above the coefficient of friction of the material in; whatever combinations of varying coeflicient of friction of the material, variations in speed of the drive motor and variations in grade in the pan line may occur.

With reference now in particular to Figure 5,

diagrams A, B C, D, and E, illustrate several forms and combinations of mechanisms for reciprocating a conveyer trough and moving materiar therealong. Diagram A'shows a simple crank and connecting rod is connected to a cross-head, Z. This mechanism will impart a reciprocatory conveying action to a conveyer trough for moving material therealong. The shorter the connecting rod k, the greater will be the difierence between the average forces at the two ends of the stroke; and the longer the connecting rod k, the 1 smaller the difference between these forces will be.

One of the chief disadvantages to such a motion, however, is that if this mechanism is proportioned to give a wide difference between the forces at the two ends of the stroke, each of these forces becdmes non- It is further de-; sirable thatthe coefficient of friction of the ma- It should be undersnare:

that the moving effect of the mechanism may be studied independently of any moving action it may receive from the connecting rod driving the. mechanism, the connecting rod m has been considered to be of infinite length. The connecting rod m is connected to one lever arm n'of a bell crank member 0 and moves this lever arm of said bell crank member through equal angles from a line extending through the center of oscillation of said bell crank member and substantially per pendicular to said connecting rod. A connecting link 17 is connected to another lever arm q of the bell crank member 0, which lever arm moves to one side of a line extending through theaxis of pivotal movement of said bell crank member and substantially at right angles to the average position of said connecting link.

It being considered that the lengths of the connecting rod 112 and connecting link p are such that their angular motion is negligible, the study of themechanism shownin Diagram B has demonstrated that the greater the angle through which the lever arm q is moved to one side of a line drawn through the center of oscillation of the bell crank member 0 and perpendicular to the average position of the connecting link 12 within workable limits, the greater will be the difference between the forces of acceleration and deceleration at the two ends of the stroke. The disadvantages of the mechanism shown in Diagram B, however, are the same as those in the mechanism shown in Diagram A; namely, that the forces be-' A and the connecting rod connecting these two mechanisms together is relatively short, the characteristics of the resulting action are similar to those in Diagrams A and B and the proportion of the non-uniformity-of the forces is not much altered for the same difference between the.

forces.

Considering now the mechanism shown in Diagram C, a connecting rod s is connected to one lever arm t of a bell crank member u. Considering the connecting rod s as being driven by a suitable crank and as being of infinite length so its angular movement is negligible, said connect-. ing rod moves the lever arm t of the bell crank member u to one side of a radial line extending from the axis of pivotal movement of said bell crank member and substantially perpendicular to said connecting rod. A connecting link 0 is connected to another lever arm in of the bell crank member u and said lever arm and connecting link are moved through equal angles from a radial. line extending through the axis of pivotal'movement of the bell crank member u and substantially at right angles to said connecting link in-its average position. I

Diagram B, with the exception that it is possible to'obtain' a' greater difference between the forces at both ends of the stroke with the same degree of non-uniformity or to obtain the same difference betweenv the forces at both ends of the stroke with a greater degree of uniformity. This is particularly true during the acceleratingportion of the forward stroke.

It has been found that when the mechanism shown by Diagram C of Figure 5 is driven from a crank shaft by a connecting rod of a length comparable to the length of the connecting rod k in DiagramA, that the effect of the connecting rod angleon the resulting motion is such as to destroy the advantages' of this mechaniism over those shown in Diagrams A and B.

'It is therefore apparent that of the three usual methods of driving shaking oonveyers, that the most desirablev isthat shown by Diagram C when this mechanism isdriven by a connecting rod having little or. noangular motion.

Angularity of the connecting rod .9 is reduced.

by the addition of the mechanism shown by Diagram. B to the mechanism shown by Diagram C and positioning said mechanisms with respect to each other anddriving the connecting rod s from the bell crank member 0 in a manner which will hereinafter be more fully described.

.Referring now in particular to Diagram D of Figure 5 in which the mechanisms shown by Diagrams A, B, and C have been combined, the connecting rod is and crank :i, as well as the bell crank members 0 and u, each contribute to the difference between the forces at the two ends of the stroke. In order to obtain the greatest difference between the forces at the two ends of the stroke, it is necessary that the parts be so assembled with relation to each other that the higher forces of acceleration and. deceleration of each unit occur at the same end of the stroke, and that the lower forces of acceleration and deceleration of each unit occur at the other end of the stroke. It is apparent that the greater forces of acceleration and deceleration of the bell crank members 0 and u must occur at the same time or else the effects of one will destroy the effect of the other, and in order that these forces may occur at the same time, and in order that angular motion of the connecting rod s may at the same time be reduced to a minimum, the pivotal axes of said bell crank members must be placed on opposite sides of the longitudinal axis of said connecting rod.

While it is possible to place both of the pivotal axes of the bell crank members 0 and u on the same side of the longitudinal axis of the connecting rod s, and in so doing reduce the angular motion of said connecting rod to zero, it has been found that with this arrangement the higher forces of each of said bell crank members will occur at opposite ends of the stroke and the effect of one will destroy the effect of the other.

It has been found that a combination of two or more elements, each producing a slight difference in accelerating forces, will give a final motion wherein the difiierence between the accelcrating forces approximate the sum of those obtained from each of the elements and the material moving ability of the final motion will be superior in proportion to the maximum moving forces which might be obtained fro-m any single unit so proportioned as to give the same difference between the two average forces.

lflhe mechanisms shown by Diagrams A, B, and C have previously been combined into one conveye-r drive unit in such a manner that the forces :1 clockwise stroke, but angular movement, of the: connecting rod. connecting the two bell crank members to.-

gcther spoils the final conveying efiectand while: the final movement may bean improvement over that produced by any one single. mechanism or.

combination of any two. of these mechanisms, the.

final conveying efiect is not. one which has a maximum coal moving ability for the same maximum force.

1 members at the sameend of the stroke, the pivotal axes of said bell crank members have been arranged on opposite sides of the longitudinal axis of said connecting link in such a manner that the major portion. of the are through which the lever arm q of the bell crank member 0 moves is in a position clockwise from a line extending through the center of oscillation thereof and. substantially perpendicular to the average position of said connecting link, while the major portion of the arc through'which the lever. arm t of the bell crank member u moves is in a position clockwise from a line extending through thecenter of oscillation of said. second mentioned bell crank member and substantially perpendicular to 1 an average position of said connecting link from said first mentionedlever arm of said first mentioned bell crank member.

While the drawings show the entire are through which the lever arms q and t travel in a position from perpendicular lines I passing through the centers of oscillation" of the bell crank members 0 and u, and perpendicular to the average position of the connecting rod s, it should be understood that the entire portion of the arcs need not be so positioned aslong as the major portion of the arcs are in a position clockwise from said aforementioned perpendicular lines. It should also be understood that the drive mechanism may be so'arranged that the major portion of the arcs are in positions counter-clockwise from said aforementioned perpendicular lines without affecting the final drive action of: the mechanism.

It may thus be seen that the element shown by Diagram C, when combined with the element'sshown by Diagrams A and B, and when operated by a connecting rod having a minimum amount of angular motion, produces a more desirable final motion than has formerly been produced wherein a greater coalor material moving force is provided in proportion to the maximum accelerating force.

With reference to Diagram of Figure 5, said diagram is inserted to illustrate the fact that the positions of the bell crank members 0- and u with respect to each other may be changed without materially changing the effect of the drive action as long as the axles of pivotal movement of the bell crank members 0 and u are on opposite sides of the longitudinal axis of the connecting link- 8 connecting these bell crank members together; and as long as the same angular relation at both ends of the stroke between the lever arms q and'i v (if-acceleration occur: at: the same end: of: that ment shown; in Diagramv E is of a more compact form than that shown in Diagram D, and while the. angular relation between the lever arms q and t of the bell crank members 0 and u are the same with respect to the longitudinal axis of the connecting rod 8. at both ends of the stroke in Diagrams" D and .E, there will 'be a slight difference in their angular relations during the stroke;

This difference. is reduced as the length of the.

connecting rod 5 isincreased. but for any prac-' tical: connecting: rod length it does not result in any material. change in the final motion.

Referring now to Figure 6 showing diagra matically: the. arrangement of drive mechanism shown in Figures 1 to 4, inclusive, and the development thereof from the arrangement shown by solid linesin Diagram E of Figure 5, said drive arrangement is developed by first projecting the first lever arm 'n of the first bell crankmember'o I crankmember u, are likewise projected about the axis of oscillation of the bellcrank member 0 until' positioned in the desired relationship. Here.

again, the angle- 2; between the second lever arm q of the first bell crank member 0 and the extended longitudinal axis of the connecting rod 3 ismaintained andthe angle 0 between the first lever arm t of the second bell crank member w and connecting rod s is maintained, When in such a position, the second lever arrow of the second bell crank member a is projected about the axis of pivotal connection of said bell crank member until the required positionis' reached. In this case the angle d, between the lever arm 10 and the driving member connected thereto,- is maintained.

Thus 7" corresponds to the crank M, It to the connecting rod 28, n to the first lever arm 29 of the bell crank member 39, q to the secondleverarrn' 33' of said bell crank member, 13 to the firstlever arm 35- of the second bell crank member 36, w to'thesecond lever arm 35! of said bell with" respect to each other long as the crank 24- and lever arms of the bell crank members 3i;

and 36- areso arranged that the same angular relation ismai'ntained between said lever arms and the connecting rods connected thereto at both ends of the stroke so that the forces of acceleration and deceleration of the'parts occur at thefsame time and angular movement of the connecting rod 34- is reduced to a minimum. 1

In a broader aspect, it will be observed that the two bell crank mechanisms shown in Dia grams B and "C of; Figure 5 each include a hell crank or rockingmember which is arranged tof impart apositi vefconveying action independently of the other bell crank mechanism. The term-- I positive conveying action -.of course refers to an; action which will move material along a trough line in one direction, as distinguished from many types of rocking motions which will not produce such unidirectional movement. Moreover, when the mechanisms-shown in Diagrams B and C are connected together in the manner before described, these independent conveying actions each form a component part of the resulting conveying action of the drive mechanism.

It may thus be seen that my invention provides a' driving mechanism of, a simple construction consisting of a combination of a driving crank and connecting rods and bell crank members placed in such relation with respect to each other as to produce accelerated and retarded forward and backwardstrokes of reciprocating motion of a more efiicient character than has formerly been provided, which mechanism is so arranged as to cause the acceleration of the forward stroke and deceleration of the forward stroke and acceleration of the rearward stroke to be as uniform as possible for any given ratio between the ave-rage forward and backward forces of acceleration and deceleration and thus provide a conveying mechanism which will move mate.-

rial along a pan line in themost eflicient manfner possible without'imparting unduly heavy strains on the parts of the mechanism and that this mechanism is so constituted as to be capable of being arranged in various forms, without impairing the efficiency of-the device so as to be adapted for use in varying conditions and. more particularlyconditions where space is necessarily limited.

While I have herein shown and described one form of my invention, I do not wish to be limited to the precise details of construction or a-rrangement of parts herein shown and described, excepting as specifically limited in the appended claims. I I

I claim as my invention:

1. Ina shaker conveyer operating mechanism,

the combination with a reciprocably driven conveyer trough, two rocking members reciprocably movable about fixed pivotal axes, each of said rocking members being} arranged to. impart a positive conveying action forming a'component part of the resultant conveying action of said conveyer operating mechanism, mechanism for reciprocablydriving one of said rocking members, mechanism for connecting the other of said rocking members to said conveyer trough, and

means for connecting said rocking members to rock together-in such a manner that the con- I veying effect of one will be added to that of the other including a connecting member, the axes of pivotal -movement of said rocking members being on opposite sides of the'longitudinal axis of said connecting member and the motion of said connecting member from one end of the stroke to the other being ;a generally parallel motion, the angle between one of said rocking members and the longitudinal center line of said connecting member changing from a greater to alesser angle during the forward stroke and the angle between the other of saidrocking members and the longitudinal center; line of said connecting member changing from a lesser to a greater angle during the samestroke, and'v-ice versa during the reverse stroke.

2. In a shaker conveyer operating mechanism, the combination with a reciprocably driven con veyer trough, two rocking members reciprocably movable about .fixed pivotal. axes, eachfof; said rocking members beingarranged to impart a positive conveyingaction forming a component part of the resultant conveying action of said conveyer operating mechanism, mechanism for reciprocably driving-one of said rocking members, mechanism for connecting the other of said rocking membersto said conveyer trough, and means for connecting said rocking members to rock together in such .a manner that the con veying action of one will be added to that of the other including a connecting member, the axes of pivotal movement of said rocking members being on opposite sides of the longitudinal-axis of said connectingmember and the motion of said connecting member from one end of the stroke to the other being a generally parallel motion, the angle between one of said rocking members and thelongitudinal center-line of said connecting member changing from a greater to a lesser an- I gle during the-forwardstroke and the angle-between the other of said rocking members and the longitudinal c'enter;line of said connecting member changing from alesser -to a greater an gle during the same'stroke, which approaches a substantial right angle and vice versa during the reverse stroke.

3, In a shaker conveyer operating mechanism, the combination-with a reciprocably driven conveyer trough, a -;casing, two rockingv members mounted within said casing and reciprocably movable about fixed-pivotal axes, each of said rocking members being arranged to-impart a positive conveying action forming a, component part of the resultant conveying action of said conveyer oper ating mechanism, mechanism for reciprocably driving one of said rocking members, mechanism for connecting the other of said-rocking members to said conveyer trough, and meansfor connecting said rocking members to rock together in such a mannerthat the conveying action of one will be-addedto that, of the other including a connecting member, the'axes of pivotal movement of said rockingmembers being on opposite sides ofthe longitudinal axis of said connecting member, and the angular relation-' ship between said connecting member and rocking members being suchthat said connecting member is in generally parallel positions at opposite ends of the stroke, the angle between one of said rocking members and the longitudinal center line of said connecting member changing from a greater to a lesser angle during the forward stroke and theiangle between the other of said rocking members andtthe longitudinal center line of said connecting member changing from a lesser to a greater angle during the same stroke, and vice versa during the reverse stroke.

1 4. In a shaker conveyer operating mechanism, a reciprocably driven. member, two bell crank members pivotally movable' about parallel axes, each of said bell crank members being arranged to imparta positive conveying action forming a component part of the resultant conveying action of saidconveyer operating mechanism, a rotatable crank, a driving connection between said crank and one lever arm of one of said bell crank members for-reciprocably driving said bell crank member, a connection between one lever arm of said :other bell crank member and said reciprocably driven member, and a connecting member operatively connecting the other lever arms of said bell-crank members together in such a manner; that the; conveying effect of one bell crank ,will be added tothatof .the other, the longitudinal center line of connecting memtween one lever arinficonnedted to saidfconri her being such that the motidn v-of said co ing member is a "generally parallel-motion from one end of the stroke to/the other, "theang member, and thelongitudinal"center-dine 'o aid connecting member "changing rrom agreater to a lesser angle during theforwardstrokeand the angle between the other lever farm, "connected" to said connecting member,and the longitudinal. center line of said "connecting member changing from a lesser to agreater angle during *theisame tive conveying action forming a no" stroke, and vice versa during "the returnlstrdkep 5. In a shaker conveyer operating mechanism, the combination with a reclproceiblydriven coriveyertrough, of a casing, arotatable crank mounted within 'said 'casing, two bell crank merribers mountedw'ithin said'casin g; l crank members being jarrang'ed' to orient part ofthe resultant conveying action -of"saidf con veyer operating mechanism, a connect i pe tween said crank andflone lever arm of oneof i said bell crank members for oscillating fsaid bell crank member, a connection "'betweeniorie lever arm of said other bell crank member and said conveyer trough i'or reciproca'blydrivingsaid conveyer trough, and an operative connectionjbetween the other lever arms of "said =bell crank members for causing 'saidbell crank membersfto rock together in such: manner thatthe-c0nvt'aye ing effect of one bell *crank will be "added 'to that of the other comprising a connecting irierr'i the longitudinal center "line of "'said conn g member being between the pivotal axes for said bell crank members, andith'e-angular remnants-re between-the lever arms-oi said bell cranamenn bers connected to "said connecting member and the longitudinal center line of said some 'ctir'ig member being such 'thatthe motionbfsai necting member is a generally p'arallelmotion 'from one end of the stroke to the other, the angle between one lever arm; connected tosaid connecting member, and the longitudinal center} line of said connecting rheiiib'eirch'angi'ng from a greater as a lesser angle-during the reward stroke and the angle between the' othr lever arm, connected to said connecting member, and "the longitudinal center line or said connecting meme ber changing from a lesser to "a greateeang e during the same stroke, and vice versa during the return stroke. e e V 6. In a shaker conveyer'opera'ting *rriechanism, the combinationwith areciproc'aiblydriven cenveyer trough, "a rotating crank, 'a ro cking in'em her, a connecting'rod "connecting said crank with said rocking member, the axis "of pivotal co-nnectionof said connecting rod and rockingindem- 'ber oscillating at substantially equal angles to a radial line extending through the pivotal axis or said, rocking member and substantially per-pen dicular to the longitudinal center line of said connecting member when said 'crank'is'in 'adead center'position, 'a secondrocking member, means for operatively connecting said rocking" member .with'said conveyor trough, and a connecting member connecting said rocking members together, said connecting memben'being "so 'disposed that its longitudinal axis extends between the pivotal axes of said rocking members; and theaxes of pivotal connection of'said connecting ai -garb rocking members and *ubstantially perpendicular to-the average posit'ion of said connecting member. l

'7. In ashaker conveyer operating mechanism, the combination with a reciprocab ly "driven convey'er trough, a rotating crank, a rocking mem ber,-a connecting rod connecting said crank with said rocking member, the axis of pivotal conri'ec tion of said connecting rod to said rocking mem-' ber oscillatingat substantially equal anglesto a radial line/extending through theypivotal axis of said rocking member and substantially perpendicular to-the longitudinalcenter line 'of said connecting member when :said crank "is in a dead center position, a second rocking member, each of said rocking members being arranged fto im+ part 'a positive conveying action'forming a component part of the resultant conveying "action of said conveyer operating mechanism, "means for operatively connecting saidsecondrocking memib'er with said conveyer "trough, and a connecting member connecting "said rocking members to rock together in such 'a 'r'nanner that the conveying action of one will'be' added to that of the other,

saidconnecting member being so disposed that longitudinal center line ofsaid connecting anember changes from a greater to a lesser angle-during the 'forward'stroke and-the angle between the otherof saidrocking members and the longitu dinal center line of said connecting member changes from a lesser to a greater angle during the "same stroke, and vice 'versa during the reverse stroke; a l

8. A"shakerconveyer'drive comprising acrank armya drivemmember comprising a reciprocating'conveyer trough, and meansconnectible with said crank arm for imparting accelerated and yretarded backward and forward strokes ofreciprocating motionto said driven member com"- prising arocking member, 'a connecting rod con necting said crank arm with said rocking member, the'point of pivotal connection of said con-' necting rodto said rocking member being so ar ranged with respect to the axis of pivotal move ment of said rocking member that said'point oscillates at'equalangles to1a radial line extending through the axisof said rocking member and perpendicular to the longitudinal center line of said connecting rod when said crank is in a dead center position, another rocking member spaced from'said first mentionedrocking membena drive memberconnecting said other rocking member to said driven member, the point of pivotal connection of said other rocking member to said drive member being so arranged with respect to the axis of pivotal movement of said rocking member that it oscillates at equal angles to each side of aradial line extending through the axis of pivotal movement of said rocking member and perpendicular roan, extended longitudinal aids or til said'driven-member, and a connection between said rocking members comprising a connecting member connected to said rocking members at its ends, the points of connection of said connecting member to said rocking members being such that said points oscillate to one side of extended radial lines passing through the center of pivotal movement of said rocking members and perpendicular to the average position of said connecting member, and said connecting member being so arranged that the axes of pivotal movement of said rocking members are on opposite sides of its longitudinal center line.

9, In a shaker conveyer drive, a rotatable crank, a driven member comprising a reciprocating conveyer trough, a rocking member, a connecting rod for connecting said rocking member with said rotatable crank, the point of connection of said connecting rod to said rocking member being so arranged with respect to the axis of pivotal movement of said rocking member that said point may oscillate at equal angles to a radial line extending through the axis of said rocking member and perpendicular to the longitudinal center line of said connecting rod when the point of connection of said rotatable member to said connecting rodis in a dead center position, another rocking member spaced from said first mentioned rocking member and having connection with said driven member, each of said rocking members being arranged to impart a positive conveying action forming a component part of the resultant conveying action of said conveyer operating mechanism, and a connection between said rocking members to connect said rocking members to rock together in such a manner that the conveying action of one will be added to that of the other comprising a connecting member connected to said rocking members at its ends and disposed between the pivotal axes of said rocking members, the motion of said connecting member being such that it is in generally parallel positions at opposite ends of. the stroke and the points of connection of said connecting member to said rocking members being such that said points oscillate to one side of extended radial lines passing through the center of pivotal movement of said rocking members and perpendicular to the average position of said connecting member.

10. In a shaker conveyer drive, a rotatable crank, a driven member comprising a reciprocating conveyer trough, a rocking member, a connecting rod for connecting said rocking member with said rotatable crank, thepoint of connection of said connecting rod'to said rocking member being soarranged with respect to the axis of pivotal movement of said rocking member that said point may oscillate at equal angles to a radial line extending through the axis of said rocking member and perpendicular to the longitudinal center line of said connecting rod when the point of connection of said rotatable member to said connecting rod is in a dead center position, another rocking member spaced from said first mentioned rocking member and having connection with said driven member, and a connection between said rocking members comprising a connecting member connected to said rocking members at its ends, the points of connection of said connecting member to said rocking members being such that said points oscillate to one side of extended radial -lines passing through the center of pivotal movement of said rocking memmember being so arranged that the axes of pivotal movement of said rocking members are on opposite sides of the longitudinal center line of said connecting member.

11. In a shaker conveyer drive, a rotatable crank, a driven member comprising a reciprocating conveyer trough, a bell crank member, a connecting link for connecting one arm of said bell crank member to said rotatable crank, said arm of said bell crank member being oscillatable at equal angles to a radial line extending through the axis of pivotal movement of said bell crank member and perpendicular to said connecting link when said rotatable crank is in a dead center position, another bell crank member spaced from said first mentioned bell crank memberand oscillatable about an axis parallel to the axis of pivotal movement of said first mentioned bell crank member, a connection from one lever arm of said last mentioned bell crank member to said driven member and a connecting link connecting the other lever arm of said last mentioned bell crank member to the second lever arm of said first mentioned bell crank member, said second lever arm of said first mentioned bell crank member being so arranged with respect to said first lever arm of said bell crank member as to oscillate to one side of a radial line extending through the pivotal axis of said bell crank member and perpendicular to the average position of the longitudinal center line of said last mentioned connecting link, and said connecting link being so arranged as to be between the centers of oscillation of said bell crank members.

12. In a shaker conveyer drive, a rotatable crank, a driven member comprising a reciprocating conveyer trough, a bell crank member, a connecting link connecting one arm of said bell crank member to said rotatable crank, said arm of said bell crank member oscillating at equal angles to a radial line extending through the pivotal axis of said bell crank member and per pendicular to said connecting link when said rotatable crank is in a dead center position, another bell crank member spaced irom said first mentioned bell crank member and oscillatable about an axis parallel to the pivotal axis of said first mentioned bell crank member, each of said bell crank members being arranged to impart a positive conveying action forming a component part of the resultant conveying action of said conveyer operating mechanism, a connection from one lever arm of said last mentioned bell crank member to said driven member and a connecting member disposed between the pivotal axes of saidbell crank members and having a generally parallel motion from one end of the stroke to the other, said connecting member connecting the other lever arm of said last mentioned bell crank member to the secondlever'arm of said first mentioned bell crank member in such a manner that the conveying action of one bell crank member will be added to that of the other, and said last mentioned lever arms of said bell crank members being arranged to oscillate to one side of radial lines extending through the axes of oscillation of said bell crank members and perpendicular to the average position of the longitudinal center line of said connecting link, and said lever arm of said second bell crank member having connection with said driven member being so disposed with respect to said other lever arm as to oscillate substantially equal distances to opposite sides of a radial line perpendicular to the longitudinal center line of said driven member and extending through the "pivotal axis of said bell crank member. 7 v r} h I 13. In a shaker conveyerdrlve, a rotatable crank, adriven membercomprising a reciprocating conveyer trough, a bell-crank member, a connecting link for connecting one arm of said .bellcrank member to said rotatable crank, said arm of said bell crank member being-oscillatable at equal angles to a radial line extending through the axis of pivotal movement of said'bell crank member and perpendicular to said connecting link when said rotatable crank is in a dead center position, another bell crank member spaced from said first mentioned bell crank member and oscillatable about an axis parallel to the axis of pivotal movement of said first mentioned bell crank member, a connection from one lever arm of said last mentioned bell crank member to said driven member, a connecting link connection the otherlever arm of said last mentioned bell crank member to the second lever arm of said first mentioned bell crank member, said connecting link being so arranged as to be intermediate the axes of oscillation of said bell crank members so said first mentioned bell crank member may. move said connecting link in a path in which its posi-- tions are substantially parallel at opposite ends of the stroke.

14. In a shaker conveyer drive, a rotatable crank, a driven member comprising a reciprocating conveyer trough, a bellcrank member, a

connecting link for connecting one arm of said bell crank member to said rotatable crank, said arm of said bell crank member being oscillatable at'equal angles to a radial line extending through -the axis of pivotal movement of said bell crank member and perpendicular to said connecting link when said rotatable crank is in a dead center position, another 'bell crank-member spaced from said first mentioned bell crank member and oscillatable about an axis parallel to the axis of pivotal movement of said first mentioned bell crank member, a connection from one lever arm of said last mentioned bell crank member to said driven member, a connecting link connecting the other lever arm of said last mentionedbell crank member to thesecond lever arm of said first mentioned bell crank member, said lastmentioned lever arms being so arranged with respect to said first mentioned lever arms as to oscillate to one side of radial lines extending from the axes of oscillation of said bell crank members and perpendicular to the average longitudinal center line of said connecting link, and said connecting link being so arranged as to be intermediate the axesof oscillation of said bell crank'members.

15. In a shaker conveyer drive, a rotatable crank, a driven member comprising a reciprocating conveyer trough, a bell crank member, a

connecting link for connecting one arm of said bell crank member to said rotatable crank, said arm of said bell crank member being oscillatable at equal angles to a radial line extending through the axis of pivotal movement of said bell crank member and perpendicular to said connecting link when said rotatable crank is in a dead center position, another bell crank member spaced from said first mentioned bell crank member and oscillatab-le about an axis parallel to the axis of pivotal movement of said first mentioned bell crank member, a connection from one lever arm of said last mentioned bell crank member to said driven member, a connecting link connecting the other lever arm of said last mentioned bell crank member to the second lever arm of said first mentioned bell crank smember, said last .men-

;tioned lever arms :being soarranged with respect to said first mentioned lever arms ,as to oscillate to one side of radial lines extending from the axes of oscillation of said bell crank members and perpendicular to theaverage longitudinal center arm as to oscillate 'at equal angles to a radial line extendingthroughthe axis of oscillation of said bell crank member and perpendicular to the longitudinal centerline of said driven member.

16. In a shaker conveyer operating mechanism, a conveyer trough, means for reciprocably moving said conveyer trough comprisingfa driven member disposed beneath said conveyer trough and reciprocablymovable in a plane coincident with the longitudinal axis of said conveyer trough, a housing having a reduced portion ex tending beneath said conveyer trough, a guide in said reduced portion of said housing for guiding said driven member in a plane coincident with the longitudinal axis of saidconveyer trough, and drive mechanism mounted in said housing for driving said driven member including a motor supported by said housing, a rotatable member driven thereby, and a connecting member reciprocably movable in a horizontal plane extending into said reduced portion of said housing and having connection with a bell crank member mounted in said reduced portion of said housing for pivotal movementabout a vertical axisintersectmg said conveyer trough,and said'bell crank member having connection with said driven member. p

17. In a shaker conveyer operating mechanism,

ing said conveyer trough comprising a driven member disposed beneath said conveyer trough and drive mechanism mounted in said housing for driving said driven member including a motor supported by said housing, arotatablemember driven thereby, a bell crank member oscillated by said rotatablelmember about a vertical axis,

a conveyer trough, means for reciprocably movanother bell crank member mounted in the reduced portion of said housingfor oscillation about a vertical axis, an operative connection between said bell crank members, and a connection between said last mentioned bell crank member and said driven member.

18. In a shaker conveyer operating mechanism, a conveyer trough, and drive mechanism for reciprocably driving said conveyer trough comprising a housing, a reduced portion of which extends beneath said conveyer trough, an elongated guide in said reduced portion of said housing disposed in a, horizontal axis butin a vertical plane which also includes the longitudinal axis of said conveyer trough, a plunger slidable in said guide, a connection between said plunger and conveyer trough, and means for reciprocably moving said plunger including a motor, a bell crank member driven thereby, a second bell crank member a connecting member connecting said bell crank members together, and a connection from said last mentioned bell crank member to said plunger.

19. In a shaker conveyer operating mechanism, a conveyer trough, and drive mechanism for reciprocably driving said conveyer trough compris ing a housing, a reduced portion of which extends beneath said conveyor trough, an elongated guide in said reduced portion of said housing disposed in a horizontal axis but in a vertical plane which also includes the longitudinal axis of said oonveyer trough, a plunger slidable in said guide,

a connection between said plunger and co-nveyer of said housing, and a connection from said last 10 -mentioned bell crank member to said plunger.

WILLIAM W. SLOANE.

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