US2123685A - Drive mechanism for shaker conveyers - Google Patents

Description

July 12,1938. w. w. SLOANE 2,123,585

DRIVE- MECHANISM FOR $HAKER CONVEYIERS Filed March 13. 1-936 3 Sheets-Sheet 1 I l 3 g i July 12 1938; w w SLQANE I n 2,123,685

DRIVE MECHANISM FQR SHAKER CONVEYERS Filed March 13. 1956 3 Sheets-Sheet 2 I l I I July 12, 1938.

w. w. SLOANE- DRIVE'MECHANISM FOR SHAKER CONVEYERS Filed March 1s v19s6 s Sheets-Shee 5 Wlu L Patented July 12, 1938 UNITED STATES PATENT OFFICE DRIVE MECHANISM FOR SHAKER CONVEYERS Application March 13, 1936, Serial No. 68,618

19 Claims.

This invention relates to improvements in drive mechanisms for shaker conveyers of the type utilized for conveying loose material such as coal and more particularly to drive mechanisms in which the conveying action may be varied and the direction of coal travel may be reversed under the control of the operator.

More specifically the presentinvention is directed to improvements in construction of the type of mechanism disclosed in my prior application, Serial No. 746,979, filed October 5, 1934, which matured into Patent No. 2,077,593, and has as one of its objects to provide a drive whereby the conveyer pan line may be driven from rocking arms and puller arms rather than directly from a rotatable crank and pitman, which mechanism is arranged in a novel manner to effect a drive wherein the direction of coal travel may be reversed under control of the operator.

Another prior application, Serial No. 57,730, filed January 6, 1936, shows a variable conveyer drive mechanism wherein a crank, rotatably driven at a variable angular velocity, reciprocably drives a conveyer pan line by means of a rocking 25 member rocked by a connecting rod journaled on said crank. The device of my present invention differs from the device of my prior application in that it is reversible and in that the variably rotatable drive mechanism and connecting rod are so arranged that the driving effect of the connecting rod is relatively moderate and is added to the driving effect of the variably rotatablecrank when arranged to convey material in a forward direction and subtracted from the driving effect of said crank when arranged to convey material in a reverse direction. This results in a drive mechanism so arranged that the driving effect of the crank is greater when the variably rotatable drive mechanism is arranged to convey material in a reverse direction than in a forward direction so that the driving effect of said rotatable drive mechanism in a reverse direction may counteract the driving effect of the connecting rod in a forward direction and attain a final conveying effect 45 of the mechanism which will be the same for similar settings of the drive mechanism in both forward and reverse directions.

Other objects of my invention will appear from time to time as the following specification proceeds.

My invention may be more clearly understood with reference to the accompanying drawings wherein:

Figure 1 is a top plan. View of a conveyer drive mechanism constructed in accordance with my invention, connected to a conveyer pan line, with parts of the pan line broken away;

Figure 2 is a fragmentary plan view of the device shown in Figure l, with certain parts broken away and shown in horizontal section in order to more clearly illustrate certain details of my invention;

Figure 3 is a side elevation of the device shown in Figure 1, with certain parts broken away and shown in longitudinal section;

Figure 4 is an enlarged partial fragmentary longitudinal sectional view through the variably rotatable drive mechanism and taken substantially along line 44 of Figure 2, showing the parts of said drive mechanism positioned for conveying material along a conveyer pan line in one direction;

Figure 5 is a view somewhat similar to Figure 4, but with the parts positioned for conveying material along the conveyer pan line in an opposite direction;

Figure 6 is a sectional view taken substantially along line 66 of Figure 5;

Figure 7 is an enlarged detail sectional view showing certain details of the ;means for indicating the position of the parts for varying conveying actions;

Figure 8 is an enlarged detail sectional view showing certain details of the indicating mechanism shown in Figure 7; and

Figure 9 is a diagram or graph showing certain hypothetical velocity curves of shaker motions attainable by the shaker mechanism.

Referring now to the drawings which illustrate a preferred embodiment of my invention, a shaker conveyer drive mechanism, generally indicated by reference character I0, is provided. Said drive mechanism is mounted on a base plate I I which is adapted to be held in position on the mine bottom in the usual manner; as, for instance, a plurality of mine jacks at the corners thereof and indicated generally by reference characters I2, I2.

The general arrangement of the drive mechanism and the details of the gear reduction mechanism utilized therein are similar to those shown and described in my aforementioned prior application, Serial No. 746,979, (Patent No. 2,077,593), but as all of said parts cooperate to produce the desired variations in shaking motions including reversal thereof, said parts will herein be briefly described. s

A casing I 3 is mounted on the base plate I I in a suitable manner as by welding and comprises a cylindrical portion I4 serving as a support and housing for planetary gear reduction mechanism, generally indicated by reference character I5, and a forwardly extended portion l6 which forms a bearing support for a transversely disposed rocking shaft I.

Said rocking shaft is provided with a pair of rockingarms l8, l8 disposedat opposite-ends thereof and herein shown as extending upwardly therefrom. Said rocking arms are adapted to have suitable connecting or puller rods l9 pivot-- ally connected thereto which in turn are con nected at their free ends with opposite sides of a shaker conveyer trough 20 in a usual manner well known to those skilled in the art .(see Figures l and 2).

The rocking arms l8, are rocked by means of a rocking arm 2| keyed to said shaft within the casing i3, and depending- Said rocking arm isrockedbyfrom said shaft. a variably rotatable crank 22 by means of a relatively long connecting rod 23. It should herein be noted that the crank 22, connecting rod 23 and rocking arm 2| areso arranged that said crank will rock said rocking arm atequal angles to a line extending through the center of the rocking shaft l1 and disposed perpendicular to the longitudinal center line of the connecting rod 23 when in a dead center'position. Therocking arms I8, l8 will in turn be rocked at equal angles to a line extending through the rocking center of said arms and perpendicular tothe longitudinal center line of the puller arms |9 when said puller arms are at either of the extreme ends of their stroke; The purpose of this arrangement is to'moderate'the conveying effect of said connecting rod and rocking arms as much as possible.

The crank 22 isjournaled'at one of its ends in a suitable end plate for the casing l3 and has a cage 25 of the planetary gear mechanism "15 keyed to its opposite end. Said cage and crank shaft are journaled on a ball bearing26 mounted on the hub of said cageand'engaging a shouldered bearing surface 21 formed in a supportmember 28 rotatably mounted in the cylindrical portion M of the casing l3.

The crank 22 and planetary gear mechanism l5 are driven from a suitable motor 29'secured to one end wall of the casing l3 in a usual manner. Said motor is herein shown as beingof the electric type having a fiywheel 30 keyedon its motor shaft within the motor casing for moderating fluctuations'in speed of said motor.- Saidmotor is provided with a motor pinion 3| which meshes with and drivesan idler gear 33. Said idler gear meshes with and drives a spur gear 34-'on a shaft 35. Said shaft, is journaled'at one of its ends in'an end plate 35 disposed oppositelyfrom-the end plate 24 and is journaled intermediate its ends in a suitable bearing member 31 supported in a side wall 38 of said casing. Said shaft has a spur gear 39 keyed to its inner end which spur gear forms a sun gear for the planetary gearreduction mechanism l5.

The spur gear 39 meshes with-and drives planetary pinions 40, 4|] freely carried 'on parallelspaced shafts 4|, 4| which shafts are'secured-at their ends in the cage 25'in'a usualmanner'. Said pinions mesh with an internal ring gear 43 which serves as a reaction member for-the planetary gear reduction device. The outer periphery and side of said ring gear adjacent the end-plate36 abuts a shouldered portion of a rotatable support member 44. Saidsupport member'extends outwardly over the sides of the cage 25-and sun-gear I8 and rocking shaft I1 of the crank 22.

' It will be apparent that rotation of the sun gear'39 will'rotate the cage 25 within the internal gear 43 when said internal gear is held from movement. When said internal gear is rotated in the direction of rotation of the cage 25, the speed of rotation of said cage will be increased, and when said internal gear is rotated in an opposite direction, the speed of rotation of said cage will be decreased; 1

Referring now particularly to the mechanism for changing the angular velocity of the crank 22'which mechanism forms a part ofthe subject matter of the present invention, the same comprises a novel-arrangement for rocking the internal gear 43 alternately in opposite directions during each revolution of said crank in such a manner that the variation in angular velocity of said crank will be greater when the parts are arranged to convey material along the trough line in one direction than in anopposite direction in order to counteract the tendency of the connecting rod 23 to move material along the trough line in a forward direction when the conveying action of the crank '22 is reversed.

As herein shown, my improved mechanism includes a crank 53 formed integrally with the shaft for the crank 22 and disposed out of phase with the crank 22 in a-manner similar to that described in a prior application, Serial No. 706,787, filed January 15, 1934, now Patent No. 2,077,811.

In my improved construction, the crank 53 has bearing in an anti-friction bearing member 54 carried by a block 55. Said block is slidably guided between the prongs of a bifurcated portion 56 of an oscillating frameS'l. Said frame, as herein shown, oscillates'about a relatively long are so as to reduce'inaccuracies caused by angularity in-movement of said frame and extends to and'is journaled on the rocking-shaft H (see Figures 2 and 3).-

The oscillating'frame 51 is provided with a hollow annular extension 59 surrounding the crank 53. This annular extension forms a hub for a rocking member 60 rotatably mounted thereon and provided with a pair of oppositely disposed extensions 6| and 62. One of these extensions BI is pivotally connected by means of a relatively short link 63 to a projection64 of the rotatable support member 28. support member is mounted within the cylindrical portion M of the casing I3 for rotatable movement with respect thereto and has worm teeth formed on its outer periphery. Its general arrangement and function is similar to that-of the worm gear rings previously employed in drive mechanisms of the same type illustratedby my prior application, Serial Nor 746,979, (Patent No. 2,077,593), namely, to change the angular position of the rocking member 60 with respect to the oscillating frame 51 so as to control the violence of the shaking action, and also by suitable adjustment, as will presently appear, to reverse the direction ofshaking movement.

The'opposite projection 62-is-pivotally-con- Said rotatable nected to a projection 66 which extends outwardly from the spider 46 forming a support for the internal gear 43, as previously described, through a link 65 which is considerably longer than the link 63 and extends in the same general direction as the link 63. Said projection extends through a suitable slot 61 formed in the rotatable support member 28 so that said projection and spider may reciprocably move with respect to said rotatable support member.

A worm 69, herein shown as being formed integral with a shaft meshes with the gear teeth formed in the outer periphery of the rotatable support member 28. Said shaft has hearing at its upper and lower ends in an enlarged portion H of the cylindrical portion M of the casing l3, which portion forms a housing for said worm which is manually controlled by a hand wheel 12.

A locking means is provided for restraining the rotatable support member 28 from rotation. In the form shown, said support member is provided with a plurality of apertures, indicated by reference characters l3, 14, I5, 16, 11 and 78, respectively, which are placed at suitable intervals indicating the position of the parts where the most eflicient conveying actions may be effected by the mechanism for moving material in either a forward or reverse direction commensurate with given stresses on the drive and trough line. Said apertures are adapted to be selectively engaged by a spring-pressed plunger 19 mounted in a lug 8|! extending outwardly from said casing (see Figures 4, 5 and 6).

The plunger 19 is disengaged from any of said aforementioned apertures by means of a pair of spaced lever arms 8| actuated by an operating lever 82 (see Figure 1). The free ends of said arms engage the lower ends of projections 83, 83 extending inwardly from a member 84. Said member is secured to the outer end of said plunger and extends inwardly along opposite sides of the lug 8B.

It will be manifest that the greater the arc of movement of the internal ring gear 43 during each revolution of the crank 22, the greater will be the variation of the angular velocity of the crank 22 and the steeper will be the line of the velocity curve, indicating the deceleration of the forward stroke resulting in an increase in material travel along the trough line with a corresponding increase in stresses on the drive.

It will be observed in Figures 4 and 5 particularly, that the effective arc of rocking movement of the internal ring gear 43 may be controlled by rotation of the rotatable support mem ber 28 through manipulation of the hand wheel 12. In Figure 4, the parts are positioned so that final velocity curve will be similar to curve A in Figure 9, and movement of said support member in a clockwise direction from the position shown in Figure 4 will result in a gradual decrease in the arc of movement of the internal gear 43, which will decrease the effectiveness of the conveying action until a point is reached where there will be no rocking movement of said internal gear.

It should be understood that a crank driven at a uniform angular velocity and connected to a conveyer trough by means of a connecting rod will reciprocably drive the trough, but the motion of the trough will be such that there will beno movement of material along it except when inclined down grade. If, however, the connecting rod is relatively short and its free end is connected to a rocking member which in turn is connected to the trough line, the trough line will be reciprocably driven in such a manner that material will move along it when it is disposed along the level. The foregoing is true with the device herein illustrated, where the connecting rod 23 is longer than is usual for drives of this type, when the rocking member 60 is-positioned so that the crank 22 rotates at a uniform angular velocity. The crank 22, however, has a conveying effect when rotated at a uniform angular velocity which is due to angularity of its movement with respect to the trough, but this is only sufficient to cause material tomove along the trough line when inclined down grade. The connecting rod 23 and rocking arm 2| also have a distinct conveying effect. The final conveying action when these parts are combined is, accordingly, the sum of these conveying effects.

Movement of the support member 28 beyond the point where there is no rocking movement of the rocking member 69 will cause said rocking member to rock in an opposite direction than formerly and will reverse the conveying eifect of the crank 22 in a manner which has been clearly described in my aforementioned prior application, Serial No. 746,979 (Patent No. 2,077,593). The conveying effect of the connecting rod 23 and rocking arms 2! and I8, however, is not reversed upon reversal of the conveying action of the crank '22 so is still in a forward direction. Thus, when the rocking member 69 is in this last-mentioned position, the final conveying eifect of the drive will be the conveying effect of the connecting rod 23 and rocking arms I 8 and 2| subtracted from the conveying effect of the crank 22. When the support member is midway between the apertures 75 and Hi, the conveying effect of the crank 22 in a reverse direction will be neutralized by the conveying eifect of the connecting rod 23 and rocking arms l8 and 2 i. The velocity curve of the drive will be similar to that indicated by curve B of Figure 9, and the trough line will have no conveying effect, except when inclined down grade.

Further rotation of said rotatable support member in the same direction will reverse the direction of movement of said internal gear and change the phase of the peak of the acceleration curve so it will occur in the first 90 of the cycle of rotation of said crank. Still further rotation of said support member will gradually increase the arc of movement of said internal gear and thus increase the effectiveness of the drive action in a reverse direction until a point is reached where the plunger 19 may engage the aperture 18 at which point the drive action will be the same as indicated by curve A of Figure 9, but in a reverse direction and indicated by curve C of Figure 9.

It should herein be understood that it is desirable that the conveying effect of the rocking arms 26 and I 8 be moderate in contrast to the conveying effect of the crank 22. For this reason the length .of the connecting rod 23 has been increased to reduce angularity in movement between said crank and the rocking arm 2 I. Angularity is also reduced by arranging the rocking arm 2: so it will rock at equal angles to a line intersecting its axis of rocking movement and perpendicular to the longitudinal center line of the connecting rod 23 when in a dead center position and arranging the rocking arms l8, l8 so they will rock at equal angles to a line intersecting their axis of rocldng movement and perpendicular to the longitudinal center line of the con meeting rod "I 9 when ateither ends of its'stroke, as hasIpreviously-been described. J

When the rocking member 60 1s positioned :to reversethe direction'of travel of 'materialalong the trough line, the conveying effector the rocking arms2l, 2lrocked by thercrank '22"' and connecting rod 23Sis counteracted 'by increasing the arc of movement of the internal gear 43 and thus increasing the variationin angular velocity of the crank22."

This increasein the arc of movement'of said in ternal gear, when said rocking memberisina reverse position, is attained by arranging the parts so that the vertical component of-movement of said internal gear is less for'a'forward position than for a corresponding reverse position, so that the final conveyingeffect of the drive will be the same in either a forwardor reverse direction, as may clearly be seen with reference to Figures 4 and 5.

Thus, when the parts are positioned; as shown in Figure 5,- the final conveying action of the drive will be the same as when positioned as shown in Figure 4, but in a reverse-direction and=-will be the conveying effect of the crank 22, minus the conveying effect of the connecting rod 23 and rocking arms 2| and I8.

As a further feature of my'improved construction, I provide novel means for indicating the position of the parts and violence of-the drive when the rotatable support member 28 is in its various positions of adjustment. As herein shown, a housing member 86 is mounted on the upper side of the cylindrical portion M of the casing l3 by means of cap screws 81, 81' (see Figures '7 and 8). Said housing member has an indicating pointer 88 mounted thereon for translational movement with respect thereto. Said pointer is connected at its inner end to a member 89 slidably guided in said housing member. The member 89 has a depending portion 90 which is slidably mounted in a spiral groove 9| formed in the outer periphery of the rotatable support member 28. Suitable characters or letters are herein shown as being provided on the outer face of the housing member 86, as is best shown in Figure 'i, so said indicating pointer may indicate the position of the parts when the plunger 19 is engaged with any of the apertures 13 to "I8, inelusive, and thus indicate the violence of the conveying action and the direction of material travel along the pan line.

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 orarrangement of parts herein shown and described, excepting as specifically'limited in the appended claims.

I claim as my invention:

1. In a shaker conveyer drive, a crank driven at a variable angular velocity, a rocking arm, a connection from said rocking arm to a conveyer trough for reciprocably driving said conveyer trough and a connecting rod connecting said crank with said rocking arm, and a planetary geared reduction device for variably driving said crank, said planetary device including a reciprocably movable reaction member and means for reciprocably moving said reaction member during each revolution of said crank including an oscillating member driven by the shaft which. drives said crank, said'oscillating member beingoscillatable about an axis coaxial with the pivotal axis of said rockingarm.

2. In a shaker conveyer drive, a crank driven at a variable angular velocityya rocking arm,- a connection from said rocking arm'jto aconveyer trough :for: reciprocably driving said conveyer trough and a connecting rod connecting a said 'crankxwith said rocking :arm; and' a planetary geared reductionrdevice for variably driving said crank,1said planetary device including a reciprocably movable reaction member and means for reciprocablyimoving-said reaction member during each revolutionj-of saidcrankincludingan oscillating member driven 'by the shaft which drives said crank, said oscillating: member being oscillatableabout an arc whose radius is greater than the lengthiof"saidconnecting rod.

3. In a-shaker conveyer drive, a crank driven at a variable angular velocity, a rockingarm, a connection from said-rocking arm to a conveyer trough"for-reciprocably driving. said conveyer trough" and a relatively long connectingrod connecting said crank with said rockingarm, and a planetary geared reduction-device for variably driving said crank-said planetary :device including are'ciprocably movable reactionmember and means for 'reciprocablymoving said reaction member during each" revolution of saidcrank including-'an-oscillatingmember of a-greater length than-said connecting rodand driven by the shaft-which drives said crank said oscillating member'being roscillativelymovable about an axis disposed -parallel-to the pivotal axis of said crank: T a i 4. Ina shaker conveyer-drive, a crank rotatable at a variable angular velocity, a rocking arm a connection from said rocking arm-toa conveyer trough for reciprocably-driving said conveyer 'trough'and a- 'connecting rod connecting said crank with said rocking arm, and .a planetary geared'reduction device fordrivinglsaid crank, said planetary device including a reciprocably movable reaction member;- andmeans for reciprocably moving said reaction member for varying the angular velocity of said crank during each revolution thereof comprising. an oscillating member pivotallymovable about an axis coaxial with" the pivotal axis of saidrocking arm.

5. In- 'a-shakei" conveyer drive, a planetary geared're'duction device including a'driven crank, a movable reaction member for varying the angular-velocity of said: crank during each revolution thereof; means-for reciprocablymoving said reaction member; and meansfor changingthe positionof-saidmoving means forchanging the angularvelocityi-of saidcrank-and reversing-the direction of movement of material along said conveyer trough; and 'aconnection from said crank to-said conveyer trough for reciprocably driving said trough; said' connection having a conveying effect inone direct-ion and being arranged so that this conveyi'ng eifectds added to the conveying effect transmitted" by said crank-when the angular velocity: of said crank -is variedby saidreactionl-member' in sucha manner as to cause material-to move-along said= trough in one direction and 'subtractedi-from the conveying effect transmitted'by "said-r crank when the angular velocity of said crank is variedby said-reaction member in such 'a 'manner as-to cause material to move along said-trough in anopposite direction and including a-rocking'member and a'connecting rod connected between said crank and rocking member."

601m a shaker conveyer drive, a planetary geared reduction device including a driven crank,

a movable reaction member for varying the anguthereof, means for reciprocably moving said resaid trough, said connection having a conveying effect in one direction and being arrangedso that this conveying effect is added to the conveying efiect transmitted by said crank when the angular velocity of said-crank is varied by said reaction member in such a manner as to cause material tomove along said trough in one direction and. subtracted from the conveying efiect transmitted by said crank when the angular velocity of said crank is varied by said reaction member in such a manner as to cause material to move along said trough in an opposite directionand including a rocking member, a connecting rod connected between said crank and one lever, arm of saidrocking member for rocking said lever arm at equal angles to a line extending through the center of said rocking member and perpendicular to the longitudinal center line of said connecting rod when in a dead center position, a puller rod connectingsaid lever arm with said conveyer trough, said last-mentioned lever arm rocking to equal angles to a line intersecting the axis of rocking movement of said arm and disposed perpendicular to the longitudinal center line of said puller rod when in a dead center position.

= 7. In a shaker conveyer drive and in combination with a reciprocably driven conveyer trough, a crank, an epicyclicgear train for driving said crank, said gear train including a reaction member movable in opposite directions during each revolution of said crank, a rocking member for reciprocably moving saidreaction member, and means for shifting the positionof said rocking member for changing the angular velocity of said crank to change the intensity of the conveying effect thereof and reverse the flow of material along said trough, a connection fromsaid crank to said conveyer trough including a rocking arm and a relatively long connecting rod connected between said crank and rock-,

ing arm, said rocking member and the connections therefrom to said reaction member being so arranged that the final conveying effect of' said drive is the sum of the conveying effect transmitted by'said crank and the conveying effect ofisaicl connecting rod and rocking arm when the angular velocity of said crank is such as to convey material along said trough in one direction and the difierence of the conveying effects transmitted by said crank and the conveying efiect of said connecting rodand rocking arm when the angular velocity of said crank is such asto convey material along said trough in an opposite direction. r

8. In a shaker conveyer drive, a crank rotatable ata variable angular velocity, a rocking arm, a connection from saidrockingarm to a conveyer trough for, reciprocably drivingvsaid conveyer trough, and aconnecting rodconnecting said crank with said rocking arm, a planetary geared reduction device for driving said crank, said planetary including a reciprocably movable reactionv member,.,and means ,for reciprocably moving said reaction member comprising, a rocking member rockable aboutan axisparallel to and rotating about the axis of rotation of said crank, a link connected fromone end of said rocking member to said reaction member, another .link pivotally connected from the opposite end of said rocking member to a point adapted to be-flxed from movement during operation of-the drive, and anoscillating member driven by the means for driving said crank, for rocking said rocking membensaid oscillating member being pivotally movable about an axis coaxial-with the pivotal axis of said rocking arm.

9. In a shaker conveyer drive and in combination with I a reciprocably driven conveyer trough, acrank rotatably driven at a variable angular velocity, a rocking arm, a connection from said rocking arm to said conveyer trough forreciprocably driving said conveyer trough,

and a connecting rod connecting said crank with said rocking arm,-said connecting rod and rocking arm havingaconveying effect in one direction only, means for driving said crank at a variable angular velocity comprising a planetary geared reduction device having a movable reaction member, and means for reciprocably moving said reaction member comprising a rocking member having a movable fulcrum, means for changing the position of the fulcrum of said than in a reverse direction to counteract the conveying effect of said connecting rod and rocking arm when material is'moved in a reverse direction along said-trough line.

10, In a shaker conveyer drive and in combinationfwith a reciprocably driven conveyer trough, a crank rotatably driven at a variable angular velocity, a rocking arm, a connection from saidvrocking arm to said conveyer trough for reciprocably driving said conveyer trough and a connecting rod connecting said crank with said rocking arm, said connecting rod and rocking arm havinga conveying effect in one direction only, means for driving said crank at a variable angular velocity comprising a'planetary geared reduction device having a movable reaction membenandmeans for reciprocably moving said reaction member during each revolution of said crank for varying the angular velocity thereof including av rocking member, means for changing the position of the fulcrum of said rocking member for varying the extent of movement of said reaction member and reversing the order of movement thereof for reversing the flow of materialalong said trough, and a connection from said rocking member to said, reaction member for moving said reaction member through a'greater arcwhen said rocking member is arranged to convey material along said trough line in one direction than in a reverse direction to.counteract the conveying effect ofsaid connecting rod and rocking arm wherrmaterial is moved in a reverse direction along said trough line, and means for rocking said rocking member comprising an oscillating arm pivotallymovable about an axis coaxial with the pivotal axis of said rocking arm.

11. In a shaker conveyer drive and in combination with a reciprocably driven conveyer trough, av shaft having a crankthereon rotatably driven at a variable angularvelocity, a rocking arm, a connection fromsaidrocking arm to-said conveyertrough for .reciprocably driving said conveyertrough, and a connecting rod connecting said crank with said rocking arm, said connecting rod and rocking arm having a conveying effect in one dir'e'ction-o'nly, mean's for'driving" said crank at a variable =anguiar velocity comprising a planetary'gearedreduction device having a movable reaction member, andrneans for reciprocably moving said reaction member comprising a rocking member having a movable fulcrum, means for changingthe position of the fulcrum of said rocking membei' for varying the extent of movement of said reaction member and reversing the order of movement thereof for reversing the flow of material along "said trough, a connection from said-rocking member to said a reaction member for moving said 'reaction member through a greaterarc when-said r'ocking member is arranged to convey material along said trough line inone directionthan in the reverse direction to counteract the conveying-effect of said connecting rod and rocking'armwhen material'is'moved'in a, reversedirection along said trough line, and meansfor'rocking said rocking member comprising an oscillating-member oscillatably driven by said crank 'shaft='and pivoted for movement about 'an axis coaxial with the pivotal axis of said rocking arm.

12. In a shaker conveyer drive, a driven shaft having a crank thereon, planetary drive gearing for driving said crank at a predetermined variable angular 'velocit'y'including a reaction member movable in opposite directions 'during each revolution of said cr nhand-means for reciprocably moving said reaction member in 'tirned relation with said: crank including a pivotally mounted oscillating "member,- a connection-between said driven shaft and oscillating member,

and a connection between said oscillating member and reaction -member including a rocking member pivotally mounted on said oscillating:

member, a link pivotally" connecting one end'of said rocking -member with said reaction-mem mounted oscillating member, a connection-between said driven shaft and oscillating-member, and a connection between said oscillating member and reaction member including a "rocking member, pivotally; 'm'ounted-"on said oscillating membena linkpivotally connecting one end of said rocking memben-with'said reaction-member, a rotatable support'member' adapted to be fixed from'movement during'operation of said---conveyer, and another'link 'sho'rter than -sai'd firstmentioned linkgand extending in thesame general direction as said-'first-'-mentioned link for pivotally connecting the" other end of said rock-v ing member with said support member.

14. In a -shaker conveyer drive, acrank driven at a variable angular velocity, a--rocking arm, a connection from said rocking'arm t0 atonveyer-trough for reciprocably driving said conveyer trough and a connecting rod connecting said crank with said rocking arm, a planetary gearedreduction device for variably driving said crank, said planetary including a reciprocably ing member with saidreaction-member, asupportmember adapted to be fixed from movement during operation of said conveyer; and-another link extending in the same general direction as said first-mentioned link pivotally connectingthe other end of said rocking member with said support member.

'15. In a shaker conveyer drive, a crank rotatable at a variable-angular velocity, a rocking arm, a connection from said rocking arm to a conveyer trough for reciprocably driving said conveyer trough-and a connecting rod connecting said crankwith said rocking arm, aplanetary geared reduction device for driving said crank, said planetary including a reciprocably movable reaction member, and means for reciprocably moving said reaction member for varying the angular velocityof said crank during each revolution thereof comprising an oscillating member pivotally movable about an axis coaxial 'with the pivotal axis of said rocking arm, a rock- -ing member pivotally mounted on said oscillatinglmember, a-link pivotally' connecting one end of "said rocking-member with said reaction-member, asupport member adapted-to'be fixed from movement during operation of said conveyer, and another link extending in the same general direction as saidfirst inentioned link pivotally connecting the other end I ofsaid rocking member with said support member.

' 16. In a shaker conveyer drive, a crank-driven at a variable angular velocity, a rocking arm, a connection' from Said rocking arm to a conveyer trough forreciprocably' driving said conveyer trough and a-relatively long connecting rod connecting said crank with said rocking arm, a planetary: geared reduction-device for variably driving said crank, said planetary including a reciprocably movable reaction member and means 'fo-r' reciprocably moving said reaction member during each revolution of said crank including an oscillating member of a greater length thansaid connecting rod and driven by the" shaft which drives said crank, ,Said oscillating member 'being' oscillatively movable about an axis disposed parallel to the pivotal axis of said crank, a rocking member pivotally mounted on said oscillating member, a link pivotally connecting one end ofgsaid 'ro'cking member with said reaction member, a'support memberadapted to be fixed from movement during operation of said conveyer, and another link shorter than said first-mentioned link extending in the same general direction as, said first-mentioned link pivotally connecting the; other end of saidrocking member with said support member.

"17. In a shaker conveyer drive, a crank driven at a variable angular velocity, drive. gearing for variablyjdriving saidcrank including a reciprooably'movable reaction member, means for varying the degree of movementof said reaction member and changing the conveying efi-ect of said drive including a member adjustable about an axis coaxial with pivotal axis of said reaction member, and means for indicating the position of said adjusting member and the conveying effect of the drive including an indicating pointer and means on said adjustable member adapted to engage said pointer whereby rotation of said member will move said pointer to a position corresponding to the drive position of the parts.

18. In a shaker conveyer drive, a crank driven at a variable angular velocity, drive gearing for variably driving said crank including a reciprocably movable reaction member, means for varying the degree of movement of said reaction member and changing the conveying effect of said drive including a member adjustable about an axis coaxial with pivotal axis of said reaction member, and means for indicating the position of said adjusting member and the conveying efi'ect of the drive including an indicating pointer and a groove formed in the outer periphery of said member and adapted to move said pointer upon rotation of said member to a position corresponding to' the drive position of the parts.

19. In a shaker conveyer drive, a crank driven at a variable angular velocity, drive gearing for variably driving said crank including a reciprocably movable reaction member, means for varying the degree of movement of said reaction member and changing the conveying effect of said drive including a member adjustable about an axis coaxial with pivotal axis of said reaction member, and means for indicating the position of said adjusting member and the conveying effect of the drive including an indicating pointer extending transversely of said member, and a spiral guide formed on the outer periphery of said; member adapted to move said pointer upon rotation of said member to a position corresponding to the drive position of the parts. WILLIAM W. SLOANE.

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