US1720299A - Operating means - Google Patents

Description

July 9, 1929. STEBBlNs 1.720.299

OPERATING MEANS Filed May 15, 1928 2 Sheets-Sheet 1 Julyv9, 1929. s s 1 1.720.299

OPERATING MEANS Filed May 15, 1928 2 Sheets-Sheet 2 4? //v l/ENTOR:

MM 11. W B

ATTO NEY Patented July 9, 1929.

PATENT OFFICE.

ALBERT S'IEBBINS, OF LOS ANGELES, CALIFORNIA.

OPERATING MEANS.

Application filed May 15,

This invention relates to means for imparting progressive vibratory movements to frames and other devices supported for vibratory movement.

Various devices such as screens, concentral'or tables and other forms of separators employ a progressive vibratory movement in effecting separation of the materials being treated.

l lccentrics have been extensively used heretofore to develop a vibratory movement, but the ordinary eccentric does not produce a progressive vibratory movement as it will merely move the device being vibrated back and forth as energetically in one direction as in the other. Various constructions have therefore been proposed. heretofore to modify the action of an. eccentric to cause the-same to develop a progressive vibratory movement.

Such devices for developing progressive vibratory movement should be so constructed that they will not be readily injured by the dirt and dust produced by the screens or separator beiu g vibrated and should be simple in construction. and strong and durable.

The present invention therefore relates to an extremely simple construction for modifyin g the action of an eccentric to produce the desired progressive movement, and in carrying out the present invention cables are associated with a power driven eccentric in such a way that one cable tensioned the other slacked off to thereby pull the vibratory frame back and forth, andthe progressive movement is produced by a spring which serves to modify the turn at oneend of the path of travel.

More specifically the present invention re- :sides in operating means for developing a progressive vibratory movement and consists of a positively anchored cable for pulling the frame in one direction; a yieldingly anchored cable for pulling the frame in the opposite direction, a power driven eccentric for tensioning and slacking off said cables, and in a sprin that cooperates with the positively anchorec cable to move the frame in the direction of the progressive movement beyond the throw of the eccentric so that the yieldin gly anchored cable will pull the frame back with a quick snap which will advance the materials being treated in the desired direction.

The various features of the invention and novel combination of parts will be best understood from the following description when 1928. Serial no. 277,915.

read in connection with the drawings which illustrate forms of the invention.

In the drawings;-

Fig. 1 is a side elevation of a machine provided with operating means constructed in accordance with the present invention;

Fig. 2 is a perspective view of the operating mechanism of Fig. 1;

Fig. 3 is a side elevation of a modification of the'construction of Fig, 1;

Fig. 4 is a side elevation of a second modified form of operating means;

Fig. 5 is a top plan view of the operating mechanism of Fig. 1, the vibratory frame being omitted; and

Fig. 6 is a diagrammatic view illustrating the nature of the movement imparted to the vibratory frame.

The novel mechanism of thepresent invention for developing a progressive vibratory movement may be employed forvarious purposes and is shown in the drawings as adapted to impart progressive vibratory movement to a frame 10 which frame may constitute a con centrator deck, screen or other form of separator employing a progressive vibratory movement to advance the materials being treated lengthwise of the frame 10.

Any appropriate means may be employed for supporting the frame 10 for vibratory movement in the direction of its length and this frame is shown in the drawings as mounted upon a casing or supporting structure having the uprights 11 to which the longitudinally extending beams 12 are secured and the uprights 11 are connected by the transversely extending braces 13. Upon the supporting structure are mounted the bearing blocks 14 which in the present case are shown as having ball receiving grooves or recesses formed in their upper faces to receive the balls or rollers 15 adapted to support similarly constructed bearing blocks 16 secured to the under face of the frame or carriage 10, the construction being such that the frame 10 is supported for vibratory movement in the direction; of its length.

The mechanism forming the subject matter of the present invention for imparting a pr0- gressive vibratory movement to the frame 10 will now be described, and in the construction shown consistsof a cable 17 one end of which is rigidly secured to a block 18 or other form of fastening means attached to the under face accompanying good practical length of the cable 17.

of the vibratory frame 10. The cable 17 extends in'a right-hand direction, in the construction shown, about an idle grooved sheave 19 which is rotatably supported by a transversely extending shaft 20 that is mountedupon the, casing or supporting structure. The cable 17 extends from the lower side of the sheave 19 about a groovedsheave 21 which is journaled upon an eccentric 22 which eccentric is rigidly secured to the transversely extending power shaft 23. This power shaft 1s Journaled 1n bearlngs 24 mounted upon the supporting structure and the shaft may be rotated by a pulley 25.

I tension and slacken off. the cable 17, the ar- CI e rangement being such that when the eccentric 22 is turnedto the position in which it isshown in Fig. 2, it will tension the cable .17topull the framelO. in a right-hand direction I Movement ofthe frame 10 in. a left-hand direction is effeeted in accordance with the present invention by a cable 29 one end of which is secured to the transversely extendin .blOCk 18 and the cable extends in a left-ham direction from this block about a grooved idle sheave 30 which is rotatably supported by the transversely extending shaft 31. The cable 29 extends from the lower side of the sheave 30 about a second grooved sheave 32 whichis journaled upon the eccentric 22, and theend port-ion of this cable 29 extends from the under side of the sheave 32 to a transversely extending brace 33 to which it is yieldingly secured, this beingaccomplished in the construction shown by attaching the end of the cable 29 toa threaded bolt 34 upon which a coiled'spring 35 is mounted, this spring being confined between a face of the transversely extending brace. 33, and the adjustable nuts 36 mounted upon the bolt 34.

,-As a result of the operating mechanism so far described the frame 10 will be pulled back and fortlrwitha vibratory movementby the cables 17 and 29 since the sheaves 21 and 32 mounted upon the eccentric 22 will tension one cableas the other cable is slaeked off, and the vibratory movement imparted to the frame-1O by this form of'operating means may be more or less progressive, depending upon thestrengthand tension of the spring 35. The. operating mechanism so far described is similar to that shown, described .is shown in Fig. at.

and claimed in the Albert H. Stebbins Patent No. 1,598,78 dated July 27, 1926, but it may be desirable to employ a more energetic progressive vibratory movement than that produced by the construction so far described, and this is accomplished, in accordance with the present invention, by providing an auxiliary spring which will. cooperate with the. positively anchored cable 17 to move the frame 10 more energetically in the direction ofthe progressive vibratory movement than in the opposite direction. Various constructions may be provided employing this auxiliary spring, one constructhm thereof being shown in Fig. 2, a second construction being shown in Fig. 3, and still a third construction The construction disis quite simple and. will be closed in 3 first considered.

The auxiliary spring 37 shown in Fig. 3 is mounted so that one end ol this coiled spring rests against a block or flanged plate 38 rigidly secured to the under face of the frame, 10 and the opposite end of this spring abuts against a socket plate 39 which is accurcd to a rod or bolt 40 and this bolt is adjnstably mounted in a liu'acket ll which is rigidly secured to the supporting casing. Since an eccentric 22 is employed to tension and slack-oil the operating cables 17 and 29 the movement imparted to tho frame ll) will gradually increase from one end of its stroke to its central position and then gradually dccrease from its central. portion to the opposite end of its stroke and the turn at the ends of the stroke will be relatively slow and smooth, unless such turn is moditicd by springs or other operating mechanism. As the cable 17 has its ends non-yieldably secured to the block 18 and anchoring devices 26 this cable will limit the movement of the frame 10 in the left-hand direction to the configuration ol' the operating eccentric, and as the frame 10 reaches the end of its stroke the change in direction will be relatively smooth, due to the fact that the eccentric 22 at this instant is passing through the dead centre. position in which it is shown in Fig. 3.

e As the frame 10 a] )proaches the end of its stroke in aright-hand direction it is desirable to impart a snap or quick reversal of the direction of movement to the frame, to thereby advance the materials being treated lengthwise of the frame 10 in a right-hand direction. This is accomplished by providing the auxiliary spring 37 which COOPGIMQS with the positively anchored :able 17 to increase the speed at which the frame 10 is moved in a right-hand direction, and as a result the increased momentum of the frame 10 in this direction will carry the frame son'icwhat beyond the normal end of its stroke in the right-hand direction. This additional movement will be permitted by the spring 35 which constitutes a yielding anchor for the cable 29. This additional movement, however, will place the spring under abnormal tension withthe result that this spring acting through the cable 29 will serve to jerk the frame 10- backwiu'd quickly in the left-hand direction, thereby'iinparting the desired snap or quick turn to the frame 10 to advance the materials lengthwise of the frame in a right-hand direction.

The operation of the mechanism just de scribed will be more clearly understood upon reference to Fig. (5. in which this form of movement is illustrated diagrammatically.

In Fig. 6 the power shaft 23 is shown as having the eccentric 22 and upon this eccentric is mounted the grooved sheave 21.

It is apparent that if the auxiliary spring 37 andthe spring for yieldingly anchoring the cable 29 to thesupporting structure were omitted from Fig. 3, then a non-progressive movement would beimparted to. the frame 10 and the nature of this movement would be indicated by the circle 12 of Fig. 6 and the change in} the speed of movement imparted to the frame 10 at successive intervals in its path of travel would be indicated by the vertical lines 43. Through the employment of the springs 35 and 37 whereby the momentum of the frame 10 in a right-handdirection is in creased, the frame will move beyond" the throw of the eccentric in this direction, as indicated by the curve as and will then be snapped back quickly at'the end of its stroke as indicated by the short, steep curve 45, and at this instant the desired progressive move ment will be imparted to the materials being treated upon the frame 10.

In Fig. 2 the auxiliary spring 46, instead of being arranged the same as the spring 37 of Fig. 3, is attached to the lower end of a third cable 47 which cable, as will be apparent from F 2, passes around a third sheave 48 mounted upon the eccentric 22 and then about a second sheave 19 upon the shaft 20, and the upper end of this cable is rigidly secured to the block 18. The effect of this arrangement will be the same as that of the spring 37 of Fig. 3 since the spring 46 will act upon the cable 47 to speed up the movement of the frame 10 in a right-hand direction, to produce the desired quick turn at the end of the stroke in this direction as above described.

This same result may be secured by the third. arrangement of the auxiliary spring shown in Fig. l, wherein the spring 50 is positioned to exert an upward force upon the shaft or bolt 51; this spring being confined between a transversely extending brace 52 and adjustable nuts 53 provided upon the bolt 51. The lower end of the bolt 51 is provided with a hollow block 54 through which the lower portion of the positively anchored cable 17 extends, as will be apparent from Fig. 4. The effect of this arrangement is that the spring 50 will exert a continuous pull upon the lower horizontally extending upward portion of the cable 17 td displace this portion of the cable upwardly. This upward pull will serve to speed. up the movement of the frame 10inaright-hand" direction which as above pointed out is desired to impart the quick turn to the frame 10 at the right-hand endofits stroke.

The auxiliary spring in each case obviously should be of less strength than; the anchoring spring 35, for otherwse the spring 35 would fail to pull the frame 10in. a left-hand direction with sufiici'ent force to keep the positively anchored cable 17 taut. If the frame 10 being operated is relatively heavy additional cables may obviously be provided to-rclieve the cables 17, 2,9 and 17 from excessive strains.

It will be apparent from the foregoing that the present invention is extremely simple in construction, and that the mechanism employed is strong and durable and is not likely to be injured by the dirt and dust which com monly attends separating operations.

that is claimed is z 1. In combination with a frame supported for vibratory movement, operating means for imparting progressive vibratory move ment to the frame, comprising an eccentric shaft, a sheave mounted upon the eccentric, a cable extending around one side of the sheave and having one end anchored and its other end secured to the vibratory. frame, a second cable extending around the opposite side of the sheave and having one end secured to said frame and its other end secured to a yielding anchor, means for rotating said eccentric, and an auxiliary spring arranged to increase the velocity of the movement of said frame in a direction to momentarily extend said yielding anchor as the frame reaches the end of its stroke in the direction of the progressive movement.

2. In combination with a frame supported for vibratory movement, operating means for imparting progressive vibratory movement to the frame, comprising a positively anchored cable for pulling the frame in one direction, a yieldingly anchored cable for pulling the frame in the opposite direction, a power driven eccentric for alternately ten sioning and slacking off said cables, and an auxiliary spring for increasing the velocity of the movement of the frame in a direction to momentarily increase the pull upon said yieldingly anchored cable as the frame reaches the end of its stroke in one direction.

3. In combination with a frame supported for vibratory movement, operating means for imparting progressive vibratory movement to the frame, comprising a positively anchored cable for pulling the frame in one direction, a yieldingly anchored cable for pulling the frame in the opposite direction, a power driven eccentric for alternately tensioning and slacking off said cables, and an auxiliary spring arranged to cooperate with direction, a yieldingly anchored cable for pulling the frame in the opposite direction, a power driven eccentric for alternately pulling the cables back and forth to move the frame along a path corresponding to the throw of said eccentric, and an auxiliary spring adapted to' cooperate with saidpositively anchored cable to move the frame in the direction of the progressive movement beyond the throw of said eccentric to cause the yieldingly, anchored cable to pull the frame back with a quick s'na 5. .In combination with a flame supported for vibratory movement,'operating means for imparting progressive, vibratory movement to the frame, comprising an eccentric, a cable extending around one side of the ec centric and having one end anchored and its other end secured to the vibratory frame, a second cablefextending around the opposite side of the eccentric and having one end secured to said frame and its other end secured to a yielding anchor, means for rotating the eccentric to move the frame along a path corresponding to the throw of said eccentric, and an auxiliary spring arranged to cooperate with said positively anchored cable to move the frame in the direction of the progressive movement beyond the throw of said eccentric to cause the yieldingly anchored cable to pull the frame back with a quick movement.

6. In combination with a frame supported for vibratory movement, operating means for imparting progressive vibratory movement to the frame, comprising an eccentric, a cable extending around one side of the eccentric and having one end anchored and its other end secured to the vibratory f'ame, a second cable extending around the opposite side of the eccentric and having one end secured to said frame and its other end secured to a yielding anchor, means for rotating the eccentric to actuate the cables to pull the frame back and forth, and a third cable extending around said eccentric and provided with a spring that acts upon the frame to increase its travel in the direction of the progre'ssive movement.

In testimony whereof, I have signed my name to this specification.

ALBERT H. STEBBINS.

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