US2667971A

US2667971A - Resilient bumper stop for separator screens

Info

Publication number: US2667971A
Application number: US214243A
Authority: US
Inventors: Johnson Leonard
Original assignee: Hart Carter Co
Current assignee: Hart Carter Co
Priority date: 1951-03-07
Filing date: 1951-03-07
Publication date: 1954-02-02
Anticipated expiration: 1971-02-02

Description

Sheets-Sheet l L. JOHNSON Zmvcntor Clttomegs RESILIENT BUMPER STOP FOR SEPARATOR SCREENS Feb. 2, 1954 i Filed. March 7, 1951 Feb. 2, 1954 JOHNSQN 2,667,971

RESILIENT BUMPER STOP FOR SEPARATOR SCREENS Filed MarGh 7, 1951 2 Sheets-Sheet 2 Z v .a9 J

nventor Patented Feb. 2, 1954 RESILIENT BUMPER STOP FOR SEPARATOR SCREENS Leonard Johnson, Minneapolis, Minn., assigner to Hart-Carter Company, Minneapolis, Minn.,

a corporation of Delaware Application March 7, 1951, Serial No. 214,243

2 Claims. (Cl. 209-320) My invention relates to grain separator construction and more specifically to improvements in grain separators utilizing sieves or screens which slope downwardly in the direction of flow and which are caused to oscillate rapidly to enhance the separating of the grains fed through the machine.

More particularly, my invention relates to separators having sloping screens, as above indicated, which partake of oscillatory movements transversely of the direction of flow, and has for its primary object the provision of novel means to prevent grain from iiowing excessively toward one side or the vother of said transversely oscillating screens.

Another object of my invention is the provision of a novel bumper or impact head which is adapted to be mounted in the path of oscillatory travel of one of said screens and engaged thereby when the screen moves to one of its limits of oscillatory movement, the impact between said screen and said head causing said screen to be jarred or jolted.

Still another object of my invention is the provision of means whereby a single bumper or impact head of the above type may be caused to impart a jarring action to a plurality of oscillating screens.

Another object of my invention is the provision of novel means for mounting a bumper or impact head of the above type and of means for adjusting the position of said impact head whereby the impact therebetween and the oscillatory screen associated therewith may be varied.

Still another object of my invention is the provision of a bumper or impact head and mounting therefor which is simple and inexpensive to produce, which is highly eiiicient in operation, and which is rugged in construction and durable in use.

The above and other highly important objects and advantages of my invention will become apparent from the following detailed specification, appended claims, and attached drawings.

Referring to the drawings which illustrate the invention, and in which like characters indicate like parts throughout the several views:

Fig. l is a view in perspective of a grain separater incorporating my invention;

Fig. 2 is an enlarged fragmentary section taken substantially on the line 2 2 of Fig. l;

Fig. 3 is a fragmentary View in rear elevation on substantially the same scale as Fig. 2, some parts being broken away and some parts being shown in section; and

Fig. 4 is a fragmentary view partly in plan and partly in section taken substantially on the line 4 4 of Fig. 3.

The separating machine illustrated is of the type generally known as a dockage tester and is adapted for testing samples of grain taken from a load to be tested. The machine includes a frame structure which comprises a base member 2 supported by legs or feet at the corners thereof, a pair of laterally spaced

side frame elements

4 and 5, and a connecting top member 5. A plurality of grain separating elements in vertically spaced relationship includes a primary separating device 1, a secondary separator sieve or screen 8, and a pair ci cooperating transversely oscillating separator screens 9 and l0. The separating device 7 and the screens 340, inclusive, in themselves do not constitute the invention, and being conventional in nature, it is not thought necessary to describe the same in detail. Hence, for the sake of brevity, it is thought that the above description will be suiiicient.

Grain to be tested is fed into the conventional receiving hopper I I of the machine and is carried over the several separating devices through the machine. The grain which goes through the several separating devices is transferred from an upper separator to one therebelow, and that which is carried to the delivery end of each separating device is discharged into a cooperating one of several receiving trays or pans i2, the smallest grains, namely those passing through the separator screen or sieve l0, being deposited in a receiver or tray i3 which rests upon the base 2. It will be noted, by reference to Fig. ,1, that the several screens, particularly the transversely oscillating screens 9 and ic, slope downwardly in the direction of flow, the separating device 'l and the screen 8 being agitated by conventional means, not shown, to cause the grain to move thereover.

Means for mounting the screens 9 and l@ between the frame elements i and 5 comprises a plurality of lever-acting arms Ill which at their intermediate portions are mounted fast on rock shafts l5 that are journalled in bearing brackets I6 which in turn are secured to the side wall elements and 5 by nut-equipped screws or the like il'. The upper ends of the lever-acting arms lli are pivotally secured to mounting flanges i8 welded or otherwise rigidly secured to the frame is oi the screen ii, as indicated at Z. The lower ends of the crank-acting arms Iii have pivotal connections 2l with mounting brackets or the like 22 secured fast to the frame 23 of the lower separator screen Ill.

I provide mechanism for imparting oscillatory a motor, not shown, by the means of suitableAk power transmission mechanismsuehas a-drive belt or belts, not shown. An eccentric 26"i`s. rigidly secured to the opposite end of the drive shaft 24 and drives a pitinan arm; Z1? whichvl at'.

its free end is pivotally secured2 to-theouter end` of a crank arm 28 which extends inwardly through a slot 29 in the sidefframe-member5 and terminates in an enlarged head 39 which is rigidly secured to the adjacent rock shaft I by means of a set screw or the like 3l. With particular:reerencesto Figs', 2 and 3; it will Ibe seen that rotation of the drive shaft 24' will impart: oscillatory-'movements to the crank arm 28 a `vertical plane and: consequent oscillatory movements ofgthescreen-mounting ar-msl ifi in 'directions transversely of the machine and of 'the direction. off cw of the'v material over said screens Sand l0: f

If, for'any reason, the screens 91 and I9. are not in a. level condition; transversely of the-machine; grain Vmoving; thereon willV tend t0 gravitategftoward'the; low side or sides thereof often Vresulting poor separation. To.`- correct any such. conditiom, If. provide ar bumper' or impact .head 32 preferalclyr made from rubber or other -re'silientr material and' securedV to-'theA freeend of mounting; means. such as a

leaff spring

3,3,- by VVmeans: ofP a screw orfthe-lilreV 34; At its` other end;- the leat 'spring 33 isf bolted or otherwise rigidly secured.,r tofan inturned flange 35'integrally;I 'formedwith-r the.r side frame element` 5. The impact head 32 lies in the path of travel ci a; side portionfof; theirame- 1.3 and` is adapted tobe. impingedf thereagainst uponfoscillatory fmovement of the'Vv screen- 9A in the direction. Voi

the impact head 32.- I-'hefimpactof the; frame 9- against-thefhead-SZ causesV the grainfon the screen-.9 tube jar-red in the-directionof the. side trame-element 5 so,that, theside of thescreen 9y adjacent the.- side frame.A member.- 4` is lower than the opposite sideVA thereof, the grain will tend tox move. away-from the low side toward the longitudinal center"cf. the screen. Means formes/mathe impactfhead-- 32 with respect, to

thelimit of transverse oscillatory movement of the-screen` 9. toA normal positionsY onVv either side 0f or atvthe said limit of movement, comprises an adjustment, means rin. the nature of. athumb screw- 36.r projecting through-a. suitableaperture inthe intermediate: portion ofi thev leaf. Spring 33 and having thereon a-fheadV in thenaturey of an acorn nut-or the like 31whichengages the inner `surface of the side framey member 5.

An.. adjustment. nut.. 38. and, a,.locknut. 39V areY screwthreaded onthe thumbscrew 3.6,.oniopposite sides of` theleaf spring` 33,. By unscrewing oneof the .nuts.38. or. 39. away from the. leaf spring 3.3,and

tightening.. up off the.V other of, the saidY nuts. 38 `or 39. against.- the lea, springl 33, the operator is able. to adjust. the, normallposition of the. im-

,.pact head 32. to, a. relatively line degree` The .resilient; nature or the leaf' spring 3.3 andY that of the impact. head 32;,whil'e havingv resistance sulil'cient tocausev the grain to be appreciably jostled in the screens 9' andi I9 towardV the centers.thereof, the spring 33 issulliciently'resilienty `to permit fullv oscillatory movement` of`A said screens 9 and I0 without damaging the mechanism for imparting said oscillations. The rigidity of the connecting arms I4 causes the impact between the screen 9 and the impact head 32 to be transferred to the screen l0 so that material which may have: drifted toi one side of the screen IU- will be'jostledtoward the longitudinal center thereof.

' It should be understood that the impact head 32. and the. resilientmounting therefor may with equal facility be mounted on the opposite side frame element 4 in the event that the screens 91 andi ,|105 slopelaterally in the opposite direction. It should` alsov bej appreciated that bumpers or impact headsl mayl be installed on opposite side frame elementsr so that lateral slope in either direction could be quickly'and easily corrected. lit-is possible to manipulate the screws 38 and 39 in a manner to cause the impact head 32 to be; moved4 to.- a,- normal position` laterally-outwardly:V of the-limit.-y of: oscillatory' travel-ot the screen 9.- in the eventA that.Y the grain). has no tendencyto: glavitate toward one sideor.Y the other of the. screened or L9. Obviously, adjustment. of the: head 32; toward theopposite side frame element A4 will increase the impactA` with which the screen. 9 strikes the head. 32, whereas adjustment of the-head 32 in the-opposite direction will; decrease saidV impact. Y

Myv invention" has been. tested on. a commercial basisr and, found.l to. be completely satisfactory for the accomplishment ofV the-objectivesT set forth; and,,.while Lhave. shown. a commercial embodiment of my improved device, it will be understood that` tha same is capable of: modification Without.- departure.- fromA the spiritr and scope: ot. the invention-as. defined in the` claims.

What I. claim is; Y

1. In a deviceof the class described,4 a sup.- portingframe structure including a. pair of laterally spaced. side-frame` elements, a-relatively flat separator screen disposed betweerr said frame elements, said. screen sloping downwardly.k inV the direction:Y of: iiowf` of` material carried' thereby, means mountinggsaidf screen for oscillatory movements transverselvv of; the. direction ofnew, power driven mechanism for imparting said oscillatory movements to the screem a` rubber-likev impact headresilieniz meansgmountingsaid: impact;V head inthe patlr ot'oscillatory movement of the screen fprmovements: into and out of one;l of. the limits of oscillatory travel: thereof,` saidr resilient' means comprising a. leaf spring anchored at. oneV end to one of. said side-frame elementsfsaid impact hea'dbeing 'securedto'thefree' end of said spring,

and adjustment' screw meansAl intermediate the ends of said spring and. engageable withl thev adjacentside frame element for'varying the normal position of the impact head with respeetrtov said limitof:r oscillatory' movement of the screen, whereby theimpact between saidscreen and said headduring oscillatory movement ofthescreen may be increasedY or decreased.

2a Iny a device of the classf described, a supporting frame structurelincluding a pair of laterally spaced side frame: elements, a pair, of relatively'flateseparator screensdisposed between said frame elements, said screensd sloping downwardly in the direction of flow of material carried thereby, means' mounting said'screens in vertically spaced parallel relationship for simultaneous oscillatory movementsV transverselyv oi-` the direction of ilow-y and inoppositedirections, said" lastconnecting sa-idlscreens,l power' driven Imechanism 5 for imparting said oscillatory movements to the screens, a rubber-like impact head, resilient means mounting said impact head in the path of oscillatory movement o one of the screens for movements into and out of one of the limits of oscillatory travel thereof, said resilient means comprising a leaf spring anchored at one end to one of said side frame elements, said impact head being secured to the free end of said spring and engageable with the adjacent side of said one of the screens, and adjustment screw means intermediate the ends of said spring and engagen able with the adjacent side frame element for varying the normal position of the impact head with respect to said limit of oscillatory movement of said one of the screens, whereby the impact between said screen and said head during oscillatory movement of the screen may be increased 6 or decreased, said impact being transferred to the other of said screens through the lever-acting arms and causing material on said screens to be jarred in directions transversely thereof.

LEONARD JOHNSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 423,373 Clark Mar. 11, 1890 458,246 Westereld Aug. 25, 1891 530,546 Miller Dec. 11, 1894 FOREIGN PATENTS Number Country Date 564,413 Germany Nov. 13, 1932