USRE22209E - Feeding mechanism for shaker or - Google Patents

Description

girly/Ilz 2 Sheets-Sheet l @w HK m INVENTOR Frhs BY ATTORNEY FEEDING MECHNISM FOR SHAKER OR JIGGING JONVEYERS Oct.

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e ATToRNg-LS' Reissued Oct. 27, 1942 UNITED STATES PATENT OFFICE FEEDING MECHANISM FOR SHAKER R JIGGING CONVEYERS f Ernst R. Bergmann, Evergreen Park, Ill., assigner to Goodman Manufacturing Company, Chicago, Ill., a corporation of Illinois 16 Claims.

This invention relates to improvements in feeding mechanisms for shaker or jigging conveyers of the type utilized for picking up and transporting loose material such as coal. rock, or the like.

The principal objects of my invention are to provide a novel and simplified form of feeding device of the friction grip type, adapted to automatically extend or retract an extensible trough section with respect to a reciprocating trough section of a shaker conveyer, solely by reciprocable movement of the conveyer, which is of a more compact arrangement than formerly and includes a simpler means for actuating the gripping mechanism and controlling feeding of the extensible trough section in either direction.

Other objects of my invention will appear from time to time as the following specification proceeds, and with reference to the accompanying drawings wherein:

Figure 1 is a plan view of the in-by end of a shaker conveyer trough line having a feeding device constructed in accordance with my invention associated therewith;

Figure 2 is an enlarged fragmentary View in side elevation of the device shown in Figure 1, with certain parts broken away and certain other parts shown in longitudinal section;

Figure 3 is a plan view ofthe device shown in Figure 1, drawn to substantially the same scale as Figure 2, with certain parts broken away and certain other parts shown in horizontal section, in order to more clearly illustrate certain details of my invention;

Figure 4 is a sectional View taken substantially along line 4-4 of Figure 3,'

Figure 5 is a fragmentary sectional view taken substantially along line 5--5 of Figure 1; and

Figure 6 is a fragmentary sectional view taken substantially along line 6 6 of Figure 3.

In the embodiment of my invention illustrated in the drawings, the main elements thereof include a reciprocating trough section Ill connected to the forward end of a shaker conveyer trough line (not shown). An extensible trough section or pick-up member II is adapted to be telescopically extended or retracted with respect to said reciprocating trough section and is provided with a forwardly projecting ared shovel I2 at its forward end, which is adapted to rest on and slidably move along the ground.

The extensible trough section or pick-up member Il is supported above the ground at its rear mounted thereon on a transverse shaft I5. The upper ends of said legs extend upwardly along opposite sides of said extensible trough section and are secured to opposite upper bearing plates I6, IE, extending along and projecting laterally from the upper sides of said extensible trough section. The entire weight of said extensible trough section thus rests on the ground on the A shovel I2 at its forward end and on the shoe I3 at its rear end. l

The reciprocating trough section Ill is supported at its forward end for free reciprocable movement along said extensible trough section and guided against vertical displacement with respect to said trough section by means of two pairs of rollers I'I, Il, Said pairs of rollers are mounted on opposite sides of the forward end of a bracket I8 secured to the forward end of said reciprocating trough section. Said bracket extends around the bottom and upwardly along opposite sides of said reciprocating trough section. The lower of said pairs of rollers is adapted to be engaged by the underside of the bearing plates I6, I6, which extend laterally fromthe upper flanges of said extensible trough section and form a rolling support therefor, and the upper rollers of said pairs of rollers are spaced upwardly from said bearing plates and are adapted to prevent upward movement of said extensible trough section with respect to said reciprocating trough section. Said bracket likewise forms a mounting for the mechanism for extending or retracting said extensible trough section with respect to said reciprocating trough section, which mechanism is herein shown as being disposed beneath said reciprocating trough section.

Referring now in particular to the novel form of feeding mechanism of my invention, a bearing bar 20 is herein shown as being secured to the underside of the extensible trough section Il and extending longitudinally along the longitudinal center thereof. Opposite faces of said bearing bar are adapted to be engaged by a pair of friction grip blocks 2I and 22, for extending or retracting said extensible trough section with respect to said reciprocating trough section. Said grip blocks are mounted in a carrier member 23, herein shown as extending transversely of the conveyer. A plate 24 extends forwardly Said boss has an arcuately formed face which is adapted to engage a corresponding arcuately formed socket in the inner end of a block 2. Said block is mounted in said carrier member for slidable movement with respect thereto in a guide generally indicated` by reference character 29. A set screw 3b, threadedin an end of said carrier member, engages the end of said block opposite from the grip block 2|, to form an adjusting member for said grip block. l

The opposite grip block 22 is provided with an arcuately formed boss 33 projecting from its edge opposite from said bearing bar. Said boss is adapted to engage a corresponding varcuately formed socket in the carriermember 23.

A pair of links 35 and 36, pirotally connected to the carrier member 23 adjacent oppositeends thereof, is provided to engage the grip blocks 2| and 22 with the bearing member 261, during certain strokes of the conveyer, to extend or retract the extensible trough section Il with respect to Ithe reciprocating trough section It.

The link 351s ofthe spring link type, andits spring is of such strength that under normal operating conditions, said link will act as a solid member, but will yield whenthe forward end of the shovel I2 engages a solid obstruction, to prevent-buckling of the trough line or damage to the feeding mechanism and conveyer drive. vSaid link consists of a longitudinally extending bolt 3'I` .slidably extending through a yoke .33, and abutting the inner side of said yoke at its head. Said kyoke is pivotally connected to a rearwardly and outwardly projecting arm 39 of the carrier membernZS and is yieldably held from movement with respect .to said bolt by means of a compressionspring 45, encircling said .bolt and interposed between. said yoke and Va collar 4I. Adjustment of said spring is effected by means of a nut 42 abutting the rear face ,of said` collar.

. Positioning of the link 35 to .an .operative or inoperative `positionis effected by means Yof anarcuate shaped link 45 .and a rocking lever ,4E controlled by a hand lever 53. Said farcuately formed link is pivotally connected to a yoke ,44, herein .shown .as being threaded on the end of said bolt opposite from the yoke 38. The `opposite end of said arcuateiy formed link is .pivotally connected to the rocking .lever 4S, which is mounted Vat one of its ends on ,a vertical rock shaft 4.9. ySaid shaft extends through the bracket IB at itsupper end and is mounted at its lower end in a bracket 4.7, herein shown as being welded to the .bracket I8, and spaced below the portion of .said bracket through which the upper end of said shaft extends. Said rocking lever has an arm 50, extending inwardly from the point of connection of said arcuate link thereto, to which is pivotally connected a connecting link 5I extending, transversely of said extensible trough section. The opposite end of said connecting link is pivotally connected to `a lever arm 52 of the hand lever 53, whichis pivotally mounted on a bracket` 54 by means of a vertical pin 55.

'The link 33, as herein shown, includes a yoke 55 threaded on one end of a threaded member 5l and pivotally connected to the carrier member 2.3,bymeans of a pivotalpin '58. A yoke 53 is threaded on the opposite end of said threaded member and ispivotally connected to a forward end of an arcuately formed link Eil.' Suitable nuts, are provided to `lock said yokesfrom movement kwith respect to `said threaded member. The opposite end o'f said arcuately formed link is pivotally .connected tio .one .lever arm 16.! of .al hand lever G2. The function of said hand lever and arcuately formed link is to position the link 3E in an operative or inoperative position and hold it in such a position. Said hand lever is mounted on a vertical rock shaft S4, disposed beneath the upper iiange of the reciprocating `trough section IUQand mounted intermediateits ends in a bracket 63, secured to the bracket member IS.

The carrier member 'i is urged in the for- Wardlyinclined position shown in Figure 3, by means of yieldable links 65 and 36 connected between the bracket I8 and opposite ends of the carrier ,member 23. The purpose of said links is to urgethecarrier member 23 in the inclined position shown in Figure 3, one of said links being operativeiwhen feeding in one direction and the other of .saidf4 links being operative when feeding in an opposite direction, to engage the grip blocks 2| and 22 with the bearing member 2U, the instant the forward or return stroke of the con- Veyer has been completed, depending `upon the direction of feeding, to prevent lost motion and slipping of said grip blocks during extension or retraction of said extensible trough section. These links, however, perform no feeding function but serve merely to position the grip blocks EI and 22 in a gripping position at `the beginning ,of ,the extending or retracting stroke of the conveyer, depending upon. the direction it is desired to move said extensible trough section.

The link E5 is connectedibetween the arm 39 ofthe carrier member 123 Vand a bracket Si, projecting outwardly from the bracket I8. Said link is adapted to urge the end of said carrier member to which said spring is connected in a forwardly inclined direction, and includes a conipression spring 68 encircling .a threaded rod '69 and interposed between a collar 'i0 adjacent one end of said bolt, and a block 'II through which said bolt slidably extends. Said block is pivotally mounted on the bracket 61 in a usual manner. Adjustment of said spring is effected by a nut 12, threaded on said bolt and abutting the forward face of said collar.

The yieldable link 66 includes a threaded rod 16 having a bifurcated forward end which is pivotally connected tothe end of the carrier member 23 by means of a vertical pin 15. Said rod slidably extends through a block 'I1 which is pivotally mounted on a bracket 18, projecting laterally from the bracket I8. A compression spring 'I9 abuts the rear end of the block 'I1 at its forward end and is abutted by a collar 8l at its rear end to exert a pulling force on the end ofsaid carrier member to which said spring is connected. A nut 83 abuts the rear end `of rsaid collar and serves to eect adjustment of said spring.

The feeding mechanism is shown in a locked position in Figure 3, to lock the extensible trough section II for movement with the reciprocable trough section ID. When the mechanism is in this position, the'pivotal axis of the pivot pins of the link 35 Will be in substantial alignment with the pivotal axis of the pivot pin 49 and the pivotal axes of the pivot pins of the link 35 will be in substantial alignment with the pivotal axis of the pivot pin 64. This will rigidly connect the carrier member 23 to the links 45 and 60 and lock the grip vblocks 2l and 22y with the bearing bar 20, the spring links 65 and 66 being held in an inoperative position by the links 35 and 36. The extensible trough section will thus reciprocabh7 move with the reciprocable 'trough section upon reciprocation ofthe conveyor. When itis desired tolextend said extensible trough section from said reciprocating trough section, the hand lever 62 is swung outwardly, to move the arcuate link 60 from the position shown by full lines in Figure 3 to the position shown by broken lines in this figure. This moves the link 36 in a counterclockwise direction about its axis of connection to the carrier member 23 to an inoperative position, and permits the spring lock 66 to exert a pulling force on the carriermember 23. When the hand lever 62 is positioned as described above, the link 35 will exert a forward pushing force on the carrier member 23 upon the forward stroke of the conveyer. This will tend to pivot said carrier member in a counterclockwise direction upon the forward stroke of the conveyer and engage the grip blocks 2| and 22 with the bearing bar 26, to move the extensible trough section forwardly with the reciprocating trough section l0. Upon the return Astroke of the conveyer, the link 35 will exert a pulling force on said carrier member against the spring link 66, and tend to pivot said carrier member in a clockwise direction to permit the grip blocks 2| and 22 to be disengaged from the bearing member 2D, and permit the reciprocating trough section to move rearwardly with respect to said extensible trough section.

The extensible trough section, being wholly supported on the ground and supporting theforward end of the reciprocating trough section, has suicient frictional resistance against the ground to prevent its movement with said reciprocating trough section except when engaged by the grip blocks 2| and 22, and to cause opening of the solid lines in said iigure by said hand lever 62.

When the link 35 is in an ino-perative position and the link 36 is in a dead center position with respect to the pins 58 and 64, as shown by solid lines in Figure 3, the link 36 will tend to pivot the carrier member 23 in a clockwise direction r against the yieldable link 65 upon the forward ystroke of the conveyer, and disengage the`grip blocks 2| and 22 from the bearing member 2|). Upon the return stroke of the conveyer, the link 36 will exert a pulling force on said carrier member and tend to pivot said carrier member in a counter-clockwise direction, to engage said grip blocks with the bearing member 20 and retract said extensible trough section with said reciprocating trough section.

When it is desired that the reciprocating trough section reciprocably move along said extensible trough section, the levers 53 and 62 are both moved in an outward direction to position the links 45 and El! in the positions shown by dotted lines in Figure 3 and render the links 35 and 36 inoperative. When said links are in this position, the carrier member 23 will be urged in the inclined position shown in Figure 3 by the spring links 65 and 66. The springs of said spring links, however, are sufficiently weak that they will permit the grip blocks 2| and 22 to open and slide along said bearing `member, so the extensible trough section may move along the reciprocating trough section.

It may be seen from the foregoing that a simplified feeding device of a compact and low overall height has been provided for a pick-up member of a shaker conveyer trough line, which eliminates vertical swinging motion of the gripping parts during operation of the conveyer and utilizes one set of grip blocks, disposed beneath the pick-up member or extensible trough section of the conveyer, for feeding the extensible trough section in either direction, and which is operated in a simple manner by the manipulation of one hand lever for feeding the extensible trough section in one direction and another hand lever for feeding it in an opposite direction.

While I have herein shown and described one form in which my invention may be embodied, it will be understood that the construction thereof and the arrangement of the various parts may be altered without departing from the spirit and scope thereof. Furthermore, I do not wish to be construed as limiting my invention to the specic embodiment illustrated, excepting as it may be limited in the appended claims.

I claim as my invention:

l. In a shaker conveyer, two trough sections, one of which is extensible with respect to the other, a carrier member, gripping means mounted on said carrier member, means pivotally connected between one trough section and one end of said carrier member, for exerting a positive force on said carrier member to feed said other trough section in one direction, means pivotally connected between said trough section and an opposite end of said carrier member for exerting a force on said carrier member to feed said trough section in an opposite direction when said first mentioned means is rendered inoperative, and individual control means for said engaging means adapted to render either one of said engaging means inoperative.

2. In a shaker conveyer, two trough sections, one of which is extensible with respect to the other, a carrier member, gripping means mounted on said carrier member, two links pivotally connected between one of said trough sections and opposite ends of said carrier member, means for moving one of said links in position to engage said gripping means with said other trough section upon certain strokes of the conveyer, for feeding said trough section in one direction, and means for moving the other of said links in position to engage said gripping means with said other trough section upon certain other strokes of the conveyer when said rst mentioned link is inoperative, for feeding said trough section in an opposite direction.

3. In a shaker conveyer, two trough sections, one of which is extensible with respect to the other, a carrier member, gripping means mounted on said carrier member, two links pivotally connected between one of said trough sections and opposite ends of said carrier member, one of said links being adapted to engage said gripping means with said other trough section upon oertain strokes of the conveyer, for feeding said trough section in one direction, and the other of said links being adapted to engage said gripping means with said other trough section upon certain other strokes of the conveyer, for feeding said trough section in an opposite direction, and individual control means for rendering either of said links inoperative.

4. In a shaker conveyer, two trough sections, one of which is extensible with respect to the other, a carrier member, gripping means mountedon said carrier member, two links Apivotally connected :between one of said trough sec- 'tions .and opposite ends of .said carri-er rmember, one of said links being adapted to engage said rgripping means withsaidother trough section upon certain ystrokes of the conveyor, for :feeding said trough section in one direction, and the other of said links beingadapted 4to vengage said gripping means With -said other trough section upon certain .other strokes of the conveyer, for feeding said trough section in an opposite direction, yieldable means having connection with opposite ends of said carrier member for urging ysaid carrier member in a position toengage said gripping means with said other trough section, and individual control means for rendering either of said links inoperative and permitting the other link to feed said extensible :trough `section in the desired direction.

5. In a feeding device kfor shaker conveyors, two trough sections, one of which is extensible with respect to the other, `means operable .solely by the action of the conveyer dueto frictionalresistance of the extensible trough section on the ground, for extending or retracting said extensible trough section with respect vto said other trough section includinga carrier member, `a pair of .grip blocks carried by said carrier member, means pivotally connected between one trough section and one end of .said carrier member and operable to exert, a force on one end of said car- -rier member in a direction to cause said carrier member to engage said grip blocks with said ex- Ttensible trough section upon certain Astrokes of the conveyor, to feed said extensible trough section with respect to the other trough section in one direction, and other means pivotally connected between said trough section and anvopposite end of said carriermember and operable to exert a force on an opposite end of said carrier member in a direction to cause said carrier member to engage said grip blocks with said extensible trough section upon certain other strokes of the conveyer, to rfeed said extensible trough section in an opposite direction, and individual ycontrol means for rendering either one of said engaging means inoperative including a pair of hand levers and-connections from said hand levers to said engaging members.

6. In a feeding device for shaker conveyors, a reciprocating trough section, an extensible trough section, and means operable solely by the action of the conveyer due to frictional resistance of said extensible troughsection with the ground, `for extending or retracting said extensible trough section with respect to ,said reciprocating trough section including a carrier member, a pair of grip blockspivotally carried by said `carrier member, a bearing bar extending al-ong said extensible `trough section, means pivotally connected between said reciprocating trough section and one end of said carrier member for `exerting a force on one end of said carrier member in a direction to engage ysaid grip blocks with said bearing bar upon certain strokes of the conveyer and feed said extensible trough section in one direction, means pivotallyconnected between said reciprocating trough section and an opposite end of said carrier member for exerting a force on the other end of said carrier member in a direction to engage said grip blocks with said bearing ybar upon certain other strokes of vthe conveyer, for feeding said extensible trough section in-an opposite direction, and individual control means for ren- ,reciprocating trough Atrough section, and means operable solely by the :dering yeither of said engaging means inoperative.

'7. In ,a feeding device for shaker conveyors, a section, an extensible `action ofthe conveyer due to frictional resistance of said extensible trough section with the ground, for extending or retraOting said exten- ,sible trough section with respect to said reciprocating trough section including a carrier member, a pair of grip blocks pivotally carried by said carrier member, a bearing bar extending along said extensible trough section, means connected between said reciprocating trough section and carrier member and selectively operable to exert a force on one end of said carrier member in a direction to engage said grip blocks with said bearing bar upon certain strokes of the conveyer and feed said extensible trough section in one direction, other means selectively operable to exert a force on the other end of said carrier member in a direction to engage said grip blocks with said bearing bar upon certain other strokes of the conveyer, for feeding said extensible trough section in an opposite direction when said rst mentioned means is inoperative, and yieldable means connected'with opposite ends of said carrier member, to urge said carriermember to an inclined position to permit said gripping means to engage said bearing bar.

8. In a. feeding device for shaker conveyors, a reciprocating trough section, an extensible trough section, and means operable solely by the action of the conveyor due tofriction resistance of said extensible trough section with the ground, for extending or retracting said extensible trough section with respect to said reciprocating trough section including a carrier member, a pair of grip blocks pivotally carried by said carrier member, a bearing -bar extending along said extensible trough section, means connected between said reciprocating trough section and carrier member for exerting a force on one end of said carrier member in a direction'to :engage said grip blocks with said bearing bar upon certain strokes of the conveyor and feed said extensible trough section in one direction, means exerting a force on the opposite end of said vcarrier member to engage said grip blocks with said .bearing bar upon certain other strokes of the conveyer, for feeding said extensible trough `section in an opposite direction, yieldable means having connection with opposite ends of said carrier member, to urge said carrier member to an inclined position to permit `said gripping means to engage said bearing bar,

and individual control means operated from one side ofthe conveyor, to render either of said engaging means inoperative and control the direction of feeding movement of said extensible trough section.

9. In a feeding device for shaker conveyors, a reciprocating trough section, an extensible trough section, and means operable solely by the member in a direction to engage said grip'blocks with said bearing bar upon the forward strokes of the conveyer, or selectively move said link to an inoperative position, another link pivotally connected between said reciprocating trough section and the opposite end of said carrier member, manually operable means. to position said link to exert a force on said carrier member in a direction to engage said grip blocks with said bearing bar upon the return strokes of the conveyer or selectively move said link to an inoperative position.

10. In a feeding device for shaker conveyers, a reciprocating trough section, an extensible trough section, and means operable solely by the action of the conveyer due to frictional resistance of said extensible trough section with the ground, for extending or retracting said extensible trough section with respect, to said reciprocating trough section including a bearing bar' extending along said extensible trough section, a carrier member, a pair of grip blocks pivotally carried by said carrier member, a link pivotally connected between said reciprocatingl trough section and one end of said carrier member, manually operable means to position said link to exert a force on one end 'of said carrier member in a direction to engage said grip blocks with said bearing bar upon the forward strokes of the conveyer, or selectively move said link to an inoperative position, another link pivotally connected between said reciprocating trough section and the opposite end of said carrier member, manually operable means to position said link to exert a force on said carrier member in a direction to engage said grip blocks with said bearing bar upon the return strokes of the conveyer, and yieldable means connected between said reciprocating trough section and pposite ends of said carrier member to urge said carrier member to an inclined position to engage said gripping means with said bearing bar immediately upon the feeding stroke of the conveyer.

11. In a self-loading device for shaker conveyers, two reciprocating trough sections, one of which is extensible with respect to the other, and means for moving said extensible tro-ugh section relative to said other trough section including a carrier member disposed beneath and extending transversely of said extensible trough section and having gripping means thereon engageable with said extensible trough section during certain strokes of the conveyer, iand means pivotally connected between said other trough section and opposite ends of said carrier member and selectively movable to positions to transmit a positive force from said trough section to either end of said carrier member, to extensibly or retractibly move said extensible trough section with respect to said other trough section.

12. In a self-loading device for shaker conveyers, a reciprocating trough section, an extensible trough section mounted for telescopic movement with respect to said reciprocating trough section. and means operable by reciprocable movement of the conveyer for moving said extensible trough. section relatively to Said reciprocating trough section includingr a carrier member disposed beneath and extending transversely of said extensible trough section and having gripping means carried thereby adapted to engage said extensible trough section during certain strokes of the conveyer, and two movable links pivotally connected between opposite ends of said carrier member and having adjustable connection with said reciprocating trough section, either one of said links being movable to a position to positively lock the end of said carrier member to which it is connected for reciprocable movement kwith said reciprocating trough section, to cause said locked link to exert a force on said carrier member to grippingly engage said gripping means with said extensible trough section during certain strokes of the conveyer, and to exert a force on said carrier member in an opposite direction to release said gripping means during the opposite strokes of the conveyer.

13. In a feeding mechanism for shaker conveyers, a reciprocating trough, `an extensible trough, an inclined carrier member, a pair of grip blocks mounted intermediate the ends of said carrier member, for grippingly engaging said xtensible trough, two links pivotally connected to opposite ends of said carrier member and each extending in the same general direction as said troughs, means for selectively connect-ing the ends of said links to said reciprocating trough so that one link will serve as tension member to increase' the inclination of said carrier member and engage said grip blocks with said extensible trough during certain strokes of the reciprocating trough in one direction, and the other link will serve as a compression member to increase the inclination of said carrier member and enga-ge said grip blocks with said extensible trough during certain strokes of the reciprocating trough in an opposite direction.

14. In a feeding mechanism for shaker conveyers, a reciprocating trough. an extensible trough, an inclined carrier member, a pair of grip blocks mounted intermediate the ends of said carrier member, for grippingly engaging said extensible trough, two links pivotally connected to opposite ends of said carrier member and each extending in the same general direction as said troughs, means for selectively connecting the ends of said links to said reciprocating trough so that one link will serve as tension member to increase the inclination of said carrier member and engage said grip blocks with said extensible trough during certain strokes of the reciprocating trough in one direction, and the other link will serve as a compression member to increase the inclination of said carrier member and engage said grip blocks with said extensible trough during certain strokes of the reciprocating trough in an opposite direction, and yieldable means for urging said carrier member to a gripping position immediately upon the gripping stroke of either of said links.

15. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, an inclined carrier member having a pair of grip blocks mounted intermediate its ends, for gripping engagement with said extensible trough, a link pivotally connected to one end of said carrier member, means adjustable in one position for connecting the other end of said link in relatively fixed relation to said reciprocating trough so as to move said grip blocks into gripping engagement with said extensible trough during movement of said reciprocating trough in one direction, and release said grip b-locks from said extensible trough during movement of said reciprocating trough in an opposite direction, to feed said extensible trough in one direction, and adjustable to another position for releasing said link from its xed connection, and another link pivotally connected to the opposite end of said carrier member having means adjustable in one position for connecting its `other end in relatively fixed relation tov said reciprocating trough so as to move said grip blocks into gripping engagement With saidy reciprocating trough during movement of said reciprocating trough in one direction and release said grip blocks from said extensible trough during movement of said reciprocating trough in an opposite direction to feedV said extensible trough in an opposite direction,vand adjustableto another position for releasing said link from its fixed connection.

16. In a feeding device for'shaker conveyers, a reciprocating. trough, an extensibler trough, an inclinedicarrier member having a pair of grip blocks mountedl intermediate its ends, for grippingvengagement'` with said extensible trough, a linkv` pivotallyconnected to one end oi' said carriermember,y means. adjustable in one position for; connecting `the other end of said link in relatively fixed relation to said reciprocating trough soas'to move said grip blocks into gripping, engagement with said extensible trough during movement of said reciprocating trough inv one direction, and release said grip blocks from'said` extensibleA trough during movement of said reciprocatingr trough 'in ani opposite. die rection, torfeed saiceafrtensible` trough inv one direction, vand adjustable to anotherv position for releasing said link from' itsfixed connection, and another link pivotally connectedto the opposite end of said carrier member havingmeansadjustable. in" one position for connecting its other end ink relatively fixed' relation to said reciprocating trough so as to movexsaid grip-blocks into gripping engagement with said reciprocating trough during movement of said reciprocating trough in one direction and release said grip blocks from said extensible. troughfduring movement of said reciprocating trough in an opposite direction to feed saidV extensible troughin `an opposite direction, and adjustable -to another position for rreleasing said link from its fixed connection, and yieldable; 4tension vmeans'normally acting on theopposite ends. `of-said vcarrier member to vurge the latter `intoritsgripping position immediately uponthe gripping strokeof either of said links. Y

ERNST R.. BERGMANN.

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