US2428294A - Adjustable bar sieve for threshers - Google Patents

Description

Sept. 30, 1947. s. E. ROSS I 2,428,294

ADJUSTABLE BAR SIEVE FOR THRESHERS Filed March 16, 1944 .INVEN TOR.

Seine ET 033 ,l 1?

2 GGILt:

Patented Sept. 30 1947 Sydney E. Ross, Peoria, Ill., assignonto Hart- Garter Company, Peoria,i-Ill., a corporation of Delaware Application Mar 16, 1944-,seria1Na5 2a739 This invention has to do with the new and improved form and construction of sieve or screen "of the type which is incorporated in grain handling farm machinery such as threshing machines and is more particularly directed to the finger constructions of the tiltable slats of such screens or sieves.

The slats of the present construction are each made with a top wall and a continuous. wall extending from the rearward edge of the top wall, said [continuously extending ,wall having fingers spaced and depending ther from for the purpose of handling the grain and separating the straw therefrom under the action of a winno-wing air stream supplied in the usual manner.

It is one of the main objects of the present invention to provide the slats with turned under frearward edges forming a part or" the rearward downwardly depending wall for the purpose of extending between adjacent pairs of fingers to 'counteract bending of these fingers out of the -ugeneral plane of the rearward wall and relative 'tothe top wall; and further to provide for reinforcing the fingers throughout their lengths to "counteract flexing of any portion of each of these 2 fingers out of their normal predetermined po- 'Sitions.

" Another object of the present invention is to provide fingers having folded tips which are.-r'e1ativelyfiatand.parallel, all of said tips being disposed in the plane of the direction of the airflow 1 ofthe' winnowing air stream. These folded tips provide straw guards and at the same time provide relatively large openings for handling certain'types of large kerneled grain.- At the sametime, the fingers are so shaped as 'toalso accom- "modate a small kerneled grain under the same conditions of use depending upon the amount of tilting of the'individual sieve slats by'mea'ns of the mechanism which is connected to said slats and which is adapted to'adjust the angular position thereof.

This invention also demonstrates the use of relativelyshort folded tips for the fingers as ;well1as relatively long folded tips each respecitively :being incorporated in interchangeable screens. This provides further flexibility of grain handling and separating from straw; etc, in vieWo-f the fact that the use of the slats wherein the folded straw guards or tips of the fingers are relatively short a greater amount of baffling or tilting of'the slats will be necessary to bring the larger finger spaces into play; whereas with the-form having the longer straw guards or folded fingertips a lesser amount of bafilingis 2 required beforefthe maximum openings between fingers is exposed for active use during the winnowing operation.

Not only do the folded finger tips providea veryrigid straw guard, since they provide a substantial U shaped member inherently actively'resisting bending, but the fingers are also provided with suitable reinforcing edges that connect the folded finger tips with the under turned or foldededges of the rear wall that is provided for extending between adjacent pairs of fingers.

It is also to be noted that the various formations of fingers herein disclosed and described can all :be made from a single, original iorm jof slat providing.a substantially fiat finger depend- Y ing iromthe' rearward wall and substantially banking the inturned edges of this rear wall .difs- I posed between adjacent fingers and which'substantially flat fingers may :be formed. into any of the finger slats disclosed anddescribedin this specification. This reduces manufacturing costs and simplifies the construction of thefingered slats aswill be readily apparent to those skilled in the art.

All other objects andadvantagesand salient features-inherent in the present sieve construction will hereinafter appear in the more detailed description, havingreference to the accompanying drawings illustrating certain preferred embodiments of the invention. a

' In the drawings:

-Fig. 1 is a plan View of the screen or sieve incorporating the slats as constructed according'to trate one application thereof;

Fig. 2 is a longitudinal sectional viewtaken the principles of the present invention to illussubstantially along the line 22 in Fig. 1 'with'a portion of the middle of the screen frame broken away; i

' Fig. 3 is a face View from the rearwardside thereof of afragn'ientary portion of one of the slats with parts broken away and in section, to

illustrate slats; 7

Fig. 4 is a similar' fragmentary portionofa slat with the fingers providing a relatively large range of openings under the tilting action oi the slat; Y Y

Fig. 5 is'a sectional view taken substantially along the line 5 -5 .in Fig. 4 to show the semitubular construction of each of the fingers;

Fig. 6 is another form'of finger slat wherein the initial finger forming stage of the the finger tips have been folded;

Fig. 7 is a sectionalview of the rear edge "por- 3 tion of the slat substantially as taken along the line 1-1 in Fig. 6;

Fig. 8 is another sectional view taken along the line 88 in Fig. 6 to further illustrate the details of construction of a slat with this type of fingers; and

Fig. 9 is another fragmentary rear face view of a slat illustrating fingers somewhat modified from those illustrated in Fig. 6.

There are various ways in which the slats may be pivotally mounted in a threshing machine screen frame, and likewise there are several ways in which the tilting of the individual slats relative to the frame may be accomplished. The slats may be relatively long and operated by tilting mechanism which may be incorporated in the frame at either one side or the other, or the slats may be divided on each side of a centrally located operating mechanism for tilting the same.

The latter is the type illustrated in Fig. 1 wherein a frame pivotally supports a plurality of aligned slats i I. The operating mechanism is contained within the center longitudinal supporting member l2 and includes a shiftable rod or bar I3 pivotally connected at M to the U-shaped or Z-shaped crank ends I5 of the cross wires [6 to which the slats H are attached. As seen in Fig. 1 a shiftable arm or lever I! is suitably pivoted at l8 to the frame and has a link 20 pivotally connected thereto and to the shiftable connecting bar l3 as at 2| and 22 respectively. Any motion of the arm or lever I! will obviously draw the bar l3 forward or backward to rock the crosswires it by reason of the connected cranks l5 and the pivotal connections at M to the shiftable bar 13. Rocking of the Wires 16 about their pivotal points in the frame ID will of course angularly displace each of the slats secured to the wires to cause the sieve or screen to function in the usual manner.

Referring now more particularly to Fig. 2, it

will be noted that each slat H is provided with a top wall 23 terminating in a forwardly extending baffle portion 2Q which is bent under and reversed as at 25 to be suitably secured to the Wires l6 as at 26 in any desirable manner. Each slat is also provided with a downturned rear wall as at 2'! from which a plurality of spaced depending fingers 23 extend in the manner illustrated in Fig. 3. The edge portions 30 between the adjacent pairs of fingers are turned under as at 30 to cooperate with the top wall forming channels which extend in aligned relation longitudinally of the slat to reinforce the fingers against flexing with respect to the top wall Of the slat.

It should also be noted as best illustrated in Fig. 3 as well as in plan view in Fig. 1 that each of the slats are provided with a plurality of transverse ridges 3! with troughs 32 therebetween, the troughs 32 being aligned with the spaces between the fingers 28 and also with the turned under edge portions 30 which bridge and reinforce adjacent pairs of respective fingers.

The fingers illustrated in Fig. 4 are designated as 33 and are the same as those shown in Fig.

2 in the cross-sectional view. The fingers 33 are made by bending back the portions 34 and 35 of the blank fingers 28 in Fig. 3 substantially to the dot and dash line position indicated in the first two left-hand fingers in Fig. 3. This forms a semi-tubular finger substantially as shown in the cross-sectional view in Fig. 5 that is reinforced throughout its length against local bending along the length of the fingers while the relatively long, narrow fingers wherein relatively large ranges of openings are obtained for handling a variety of larger kerneled grains without sacrificing the strength of the fingers but actually producing fingers which are stronger throughout their length against fiexing and which are substantially reinforced against bending relative to the top wall of the slat structure.

Referring now to Figs. 6, '7 and 8, the slat illustrated in this form is provided with fingers 48 having folded tip portions ii which act as straw guards. These fingers are readily made from the blank showing in Fig. 3 by crimping in the portions 42 and 43 as illustrated in the center finger in Fig. 3 substantially at the points a and b as shown. This produces fingers having the tips dl as best illustrated in Figs. '7 and 8 which are substantially or channel cross section and relatively fiat with planes of these slat finger sections disposed substantially in line with the air flow of the winnowing air stream. Furthermore, as best shown in Figs. 7 and 8, the fingers 46 are formed by the crimping action with reinforcing walls M and E5 edging these fingers and connecting the flat folded tips All with the reinforcing bridging portions Sill of the rear wall 21. This readily counteracts any flexing of the finger itself or of the fiat folded tips ll and by connecting with the bridging portions between adjacent fingers, flexing of the respective fingers relative to the top wall of the slats is readily prevented.

The fingers 5B in the modified form illustrated in Fig. 9 are substantially the same as in Fig. 6 with the exception that the folded tips 50 forming the grass or straw guards are here somewhat longer for the purpose of obtaining the greater finger openings with the minimum angular displacements of each of the slats of the screen. As is obvious in Fig. 6, with the use of finger types shown in Fig. 6, a greater angularity will be re-' quired of the slats using this finger before the full open position of the screen or sieve is obtained. As to the openings 5! in Fig. 6 and 52 in Fig. 9 for handling smaller kerneled grain under different baffling conditions, both open at substantially the same angularity but a greater winnowing range is possible with openings such as 51 than with openings 52.

The foregoing description is directed to the preferred embodiments disclosed in the drawings to illustrate certain exemplary applications of the principles of the present invention. The invention is therefore not to be limited to the precise details of construction, form or combination of parts excepting insofar as shall be determined by the breadth and scope of the appended claims.

I claim:

1. In a thresher screen having a frame, winnowing slats pivotally mounted upon said frame, and means to adjust the angular positions of said slats, said slats each comprising a top wall terminating in a continuous wall depending from the rear edge thereof, said continuous wall having a plurality of fingers depending therefrom and having an inturned edge extending between each pair of adjacent fingers to provide a bridge to prevent bending of said fingers relative to said top wall, and said fingers each having folded tips disposed with their fiat planes in th direction of .5 the winnowing air stream and with such flat planes disposed at predetermined angles with respect to the common transverse plane of the face of the fingers, said fingers each having inturned edges connected between said folded tips and said bridge portions of said continuous Wall to reinforce said fingers against bending in the length thereof and to rigidly support said folded tips.

2. In a thresher screen having a frame, winnowing slats pivotally mounted upon said frame, and means to adjustthe angular positions of said slats, said slats each comprising a top wall terminating in a continuous wall depending from the rear edge thereof, said continuous wall having a plurality of spaced fingers depending therefrom 1 in the general plane of said continuous Wall to allow passage of small grain therebetween, said fingers each having a portion thereof crimped to fold the edges adjacent said portion substantially upon each other to form a relatively fiat straw guard along a portion of the finger lengths, said flat straw guards each being disposed substantially at right angles to the general plane of said continuous wall and in the direction of teract flexing of said fingers or said flattened portions thereof.

SYDNEY E, ROSS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 20 2,335,416 Holtzman Nov. 30, 1943 2,278,393 Vutz Mar. 31, 1942 2,326,761 Collier Aug. 1'7, 1943 2,063,499 Hall Dec. 8, 1936 675,745 Lippy June 4, 1901

Images