USRE12890E - Gyratory sifter - Google Patents

Description

A. c. BRANTINGHAM. GYRATORY SIFTER. APPLICATION FILED APR. 6,1908.

Reissued Dec. 1, 1908.

UN T D STATES PATENT OFFICE.

ALLENG. BBANTINGHAM, OF TOLEDO, OHIO.

\ GYRATORY szr'mn.

Original No. a17,9o1, amt April 11, 1906,

f all whom it may concern:

Be it known that I, ALLEN C. BRANTING- AM, a citizen of the United states residing at Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Gyratory Sifters, of which the following is a specification.

In the work of bolting or grading mill products, what are commonly known as 0 gyratory sitters have proven to be the most satisfactory machines tort-he purpose. The best type of such machines embody a vertically positioned centrally arranged driving-shaft. Such machines, when their 5 driving-shatts are mounted in bearings fixedly connected to the building, produce heavy strains upon the building structure, in operation. A construction wherein the supports for the sitter structure and also for 0 the shaft are of a yielding character is therefore desirable. It hasbeen discovered that as to have a pendulum-like movement in 5 operation, and thus relieve the building of the lateral strains which are present when such sitters are" carried by rigidly-positioned supports. The shaft in such cases may carry one or more weights at one side of its center,

0 so that it is unbalanced, as it is called, and

thus enabled when rotated to impart the required gyratory movement to the sitter. In such sitters as heretofore constructed the shaft and the sitter have traveled together,

5 so that both have partaken of the gyratory movement, with obvious disadvantages, the

chief of which can only be overcome by aconstruction wherein the shaft shall have only a rotary movement and the sitter alone 0 shall have the gyratory movement; I have therefore provided eccentric connections between the shaft and the sitter so that when the parts are properly proportioned and arranged the force of the weightswill so far 5 act oppositely to the inertia of the sitter that the latter will be driven with a gyratory movement e ual to the throw of the eccentries, while t e shaft itself will remain statlonary, or-substantially stationary, during 0 the ordinary operation of the machine.

In a sitter suspended in the manner in question there is a tendency to lungc, as it is called, at the beginning "of the operation when the sitter is first put in motion, or, in

5 other words, the sitter is apt in starting to Specification of Reiauued Letters Patent.

Roi-sued Dec. 1, 1908. I

be thrown outside of its regular and proper path of movement through which it' travels after having struck its gait or reached the regular motion which it is designed to have.

It is a further object of my invention to provide means by which this lunging shall be restrained during the initial stages of the operation, but which shall not have the effect to communicate any of the objectionable lateral strains to the building after the sitter has been put in operation and has reached its regular motion. I accomplish this object by providing, in the specific embodiment thereof herein shown, a bridge-tree carrying a step-bearing for the lower end of the shaft, said bridge-tree being independent of the sitter structure and independently mounted. The supports of said bridge-tree, like those of thesitter structure itself, are fiexiblyor pivotally connected, so as to avoid communicating the heavy lateral strains,

consequent upon the operation, to the building; but inorder to restrain the objection-, able lunging during the initial stages of the operation I provide means by which the possible travel of the bridge-treeis limited.

- It is of course not possible to prevent all gyratory or orbital movement of the shaft The machine is, however, substantially selfbalancing and self-regulating.

The accompanying drawings illustrate a construction embodying my invention.

Figure 1 is a side levation of a sitter of the character in question; Fig. 2, an end elevation thereof; Fig. 3, a sectional plan view, on an enlarged scale, as seen when looking downwardly from the .dotted lines 3--3 in Figs. 1 and 4; Fig. 4, a central vertical sectional View as seen when looking in the direction indicated by the arrows from the dotted lines 4% in Figs. 1 and 3; and Fig. 5, a detail sectional view at the point indicated at-the dotted line 5- 5 in Fig. 4..

The sitter structure 21 is or maybe an'y suitable structure of the character in question and is adapted to contain a series of sieves (not shown) suitable for the pu oses required. This structure is support -b suitable rods '22. from a oint overhea which rods are sufficiently exible or yield-. ing to permit of the proper gyratory' movement of the sifter structure appropriate to the siftin operation. The gyrator iconiprises a shaft 31, in.normal operation'rotating'and' axially stationary but in abnor 'mal operation orbitally -movable,";here1n shown as provided with fly-wheels :32 and 33 at.or near its lower and upper ends.

Suitable eccentric flanges 34 and 35 are provided on these fly-wheels which engage with corresponding fiang'es'24 and 25 secured rig idly to and centrally of the sifter strucher or bridge-tree 42. The eccentric connecture, thereby givin the shaft 31 an eccentric position relativelyto the sifter struc-.

ture. \Veights, as 37, are secured to' these fly-wheels and constitute, in theconstruction shown, the means which act oppositely to the inertia of the Sifter-structure and govern the gyratory movement of the latter. Through the comparatively large openingsthrough the center of these flange structures 24 and 25 the shaft 31 passes, said openings .beingsuflicient in size to permit the shaft to remain in position Without interfering. with the gyratory movement of the sifter.

Upon the shaft 31 at or near its. lower end .is a rotatable driver or pulley 36 by which the gyrator is driven. The construction might 'be so modified as to make theflywheels32 also serve as such pulley.

The lower end of the shaft 31 is mounted in a suitable step-bearing, as 41, in a springless, yieldingly-mounted .or swingable' mem- 31 approximates the normal center ofgyration. This bridge-tree carries'idler-pulleys or rotatable elements 43, and motion is imparted to the shaft 31 by a belt 44 running from the driver 36 thereon over said rotatable elements 43 to a pulley 51 on a driving shaft 52, as indicated in Figs. 1 and 2, and accordingly comprise the power transmission devices for the gyrator. As the dis-- tance between theshaft 31 and the pulleys 13 is a constant or nnvarying one, notwithstanding that the structure upon which they are mounted may swing about to a certain extent, and as the distance between the pulleys 43 and the driving pulley 51 is comaratively so great as to make the change '.111 distance between them (as the structure carrying the pulleys 43 swings) inappreciable, it will be readily seen that any swinging about of'the shaft 31 when the sifter is :in motion willnot appreciably alter the 's winglng or movement of translation of the *frame 42, in takingthe dr1v'er 36 w th it,

tree which I prefer to bring about the axial 'thus restrain lunging, is illustrated in thedrawlngs forming part. offthe present appliaction on shaft 31. As links 64 are much into different horizontal planes, is resisted the gyrators own weight acting on itself driving capability of the belt. Such lateral brings about axial'movemen't of the driver.- The form of supports for the bridge-- or lon itudinal actuation of the gyrator dur ingjun alanced operation of the machine and cation. The supporting means comprises brackets 61, secured to the floor of the building,'a,nd'provided with ball-and-socket bean ings -62 carried on the ends of suitably-' formed arms thereon, and the bridge-tree 42 is carried "therefrom by means of links (34', having other balland-socket joints 65 as the immediate means of connection thereto. As

shown in Fig. 3, three setsof thesebracketsupportsfare preferably employed, there being also, preferably, three bearing-arms on the bridge-tree. The links, herein shown as parallel, will easily yield for a short distance in any direction, which'lateral moveiiient is resisted by gravity due to the lifting shorter than rods 22, lateral movement of the structure ,21 will cause comparatively slight lifting action due to rods .22, while considerable lifting action is due to an equal lateral movement affecting links 6 1. Accordingly the parts supported by links 64, including the .gyrator, will be lifted relativelyjo the parts supported by rods 22 or the structure 21. This lifting, or movement by the force of gravity, shown'as the weight of the gyrator, thus bringing about the steadying of the gyrator and structure by through elements herein disclosed as indivldually rigid but collectively yielding in their-action. As the distance between the balland - socket bearings 62 and 65 is short, the arcs described by thelinks soon develop a pronounced upward tendency, thus automatically introducing an increasopposition to abnormal operation and e ectually, though not rigidly making the limit of movement small. This abnormal operation when shaft 31 travels in an orbitor swings, brings about, through the, medium of the links 64, the lifting or longi.-' tudinal actuationof the shaft 31 to a greater and greater extent as the distance ofi' center increases. Therefore the links 64' permit the swing or orbital-- travel of shaft 31, and addi- J tionally effect the restraining through the lifting of the pendulum-like action. While, therefore, there is no rigid connection between the gyratory sieve structure and the building in a machine of this character, the supporting links will effectually restrainthe lunging which is apt to occur at the time of side than the other, eccentric connections be tween said shaft and said sifter structure, abr dge-tree supporting saidshaft, yielding supports carrying said bridge-tree having a limited movement, idler-pulleys carried by the bridge-tree, a driving-shaft, and a belt running from a pulley on the driving shaft over the idler-pulleys on the bridge-tree to "a pulley on the sifter-shaft.

2. The combination of a sifter structure, means whereby the same is yieldingly suspended, a vertical shaft weighted more on one side than on the other and having a driving connection with thesifter structure,

a bridge-tree mounted independently of the sifter structure and supporting said shaft, and yielding supports for the bridgetree having a limited movement.

3. The combination of a sifter structure, means whereby the same is yieldingly suspended. a shaft arranged vertically to said sifter-structure, eccentric connections between said shaftand said sifter structure, and independently yieldingly-supported power-transmission devices leading to said shaft. A

4. The combination of a sifter structure, means whereby the same is yieldinglv suspended, a bridge-tree arranged below said sifter structure, means whereby the same is yieldingly suspended, a shaft supported by said bridgetree, eccentric, connections between said shaft and said sifter structure,

- and power transmission devices in part carried by said bridge tree leading to said shaft 5. The comb nation of a sifter structure, suspending links upon which the same is mounted, a bridge-tree, suspending-links for said bridge-tree, a shaft mounted on said br1dgetree, eccentric connections. between said shaft and said sifter structure, devices mounted upon vsaid shaft heavier upon one side than upon the other, means wherebythe swing of the bridge-tree is limited, and pour/P transmission devices leading to the shaft. V

(S. The combination of a. sifter structure, means whereby the same is yieldinglysuspended, a shaft arranged vertically to said sifter structure, a bridge-tree supporting said shaft, supports for said bridge-tree consisting of suitable brackets secured to the building structure, and pivoted links connectedto said brackets and to arms on the bridge-tree.

7, The combination with a normally gy ratable machine structure and its relatively rotatable gyrator having a shaft extending through the structure, said gyrator being abnormally orbitally movable, of a rator supporting device relatively to which the structure may be gyrated, said device mounting the gyrator independently of the structure, and power transmission devices for actuating the gyrator.

8. The combination with a machine struc-.- ture and its relatively rotatable gyrator, of

an independent. bridge-tree eccentrically connected to said structure, said-bridge-tree supporting said gyrator, ower-transmission devices also carried'by said bridge-tree, and yielding supports by which said bridge-tree is carried and which supports permit said bridge-tree to have orbital movement.

9. The combination of a normally gyratable machine structure, yielding supports therefor, an independently sup orted laterally movable steadying device or the struc-e ture, link mechanism supporting the device, an eccentric connection between said device and said structure, and means for rotating said connection, said connection being carried by the device and effective through its weight thereon to aid in the steadying.

10. The combination of a normally gyratable machine structure, yielding supports therefor, an independent orbitally movable bridge-tree, additional yielding supports therefor, an eccentric connection between said bridge-tree and said machine structure, and power-transmission devices carried by said bridge-tree.

1.1. The combination with a machine structure to be normally gyrated, supporting means therefor, and a driver rotatablerelatively to the structure for gyrating the structure, of a steadying device operatively coacting with the gyrator and structure to render gyration more uniform, said device including a swingable member normally stationary in mean position and yieldably movable from mean position in abnormal operation.

12. The combination of a- 'gyratory machine structure, supporting means therefor, a gyrator mechanism rotatable relatively to the structure and operatively connected for gyrating the structure, said mechanism abnormally movable in an orbital path, and a steadying device including a member supporting the mechanism, said member abnormally laterally lmovable and mounted to be actuated toward normal position by the mechanism.

13. The combination with a gyratory sifter 1 structure and supporting means therefor, of 1 a steadyin'g device operativel connected to mediate means having bearings operatively engaging the bearings of the members, said meansmounting the movable member and coacting to resist its lateral movement to aid in the steadying.

14. The combination of a machine struc ture, supporting means therefor permitting abnormal movement, a gyrator for the st ruc- -tor relatively to the structure as movement ture axially movable relatively thereto, and

a steadying devicefor the structure having means-connected to axially actuate the gymbecomes abnormal. p

15. The combination of a normally gyratable machine structure, supporting means therefor, a'gyrator for the structure rotatable relatively thereto, and a steadying .de-' vice for the structure relatively to which the structure may gyrate, said device including weighted means movable intodiiferent horizontal planes which movement in being opposed-by gravity aids the steadying operation of the device.

l6. Thecombination of a sifter structure, supporting means therefor, an orbitally movab e gyrator for the structure, and power transmission devicescomprising an axially 'movable rotatable driver for the gyrator, a

flexible driving means coacting with the vrotatable element relatively to which the structure is movable, said element having-an unvarymg distance from the driver, and

driverand' element. Y

17. The combination ofa sifterstructure,

4 v supporting means therefor, an orbitally movable or gyratable gyrator for the'structur'e, and power transmission devices comprising a rotatable driver for the gyrator, a laterally movable rotatable element having an un-' varying distance from the driver, said structure being movable relatively to the element,

and flexible driving means coacting with the driver and element. v

18. The combination of a sifter structure,

normally gyratable, supporting means therefor, a gyratorfor the structure abnormally orbitally movable, a mounting device for the gyrator independent of the sifter structure,

and power transmission devices comprising a rotatable drlver for the gyrator, a rotatable element having a constant distance from the,

driver, and fiexibledriving means coacting with the element and driver.

19. The combination of a sifter structure, supporting means therefor, a gyrator'opera- -tively connected to the structure and rotaing device operatively connected to said gyratorincluding individually-rigid collectively-yielding elements coacting to steady the structure in a regular path of travel and The combination of a sifter structure, supporting means therefor, a gyrator operatively connected to the structure and rotatable relativelythereto, said gyrator having table relatively thereto, and a lunge restrain-.

yielding to permit orbital movement of the gyrator in abnormal operation. a

a shaft, a movable mounting independent of said structure upon which said shaft is'cartively-yielding elementscoactin tosteady the structure in a'regularpath 0 travel and gyrator in abnormal operation.

In testimony whereof I afiix my signature in the presence of two witnesses.

H ALLEN CQBRANTINGHAM. I

-' Witnesses:

G. H. RAUCH, E. KIRK.

-ried embodying individuallyrigidcollecyieldingto permit orbital movement, of the

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