US682670A

US682670A - Grain-separating screen.

Info

Publication number: US682670A
Application number: US4151700A
Authority: US
Inventors: Charles Closz
Original assignee: Individual
Current assignee: Individual
Priority date: 1900-12-29
Filing date: 1900-12-29
Publication date: 1901-09-17
Anticipated expiration: 1918-09-17

Description

Nm 682,670. l Patented sept. 17, lsol.

c. cLosz.

GRAIN SEPABATING SCREEN.

. (Application led Dec. 29. 1900.)

(N o M o d el l. -ll'llillrllle m mnh nu mili UNITED 'STATES APATENT OFFICE.

CHARLES CLOSZ, OF` WEBSTER CITY, IOVVA.

QRAIN-SEPARATING' SCREEN.

SPECIFICATION forming part of Letters Patent No. 682,670, dated September 17, 1901.-

Application tiled December 29, 1900. Serial No. 41,517. (No model.)

.To all whom t may concern: j

Be it known that I, CHARLES Cnosz, a citizen of the United States, residing at Webster City, in the county of Hamilton and State of Iowa, have invented certain new and usefulI Improvements in Grain-Separating Screens, of which the following is a specication.

The improvement in grain-cleaning screens for threshing-machines which forms the subject-matter of this patent is illustrated in the accompanying drawings, which, in connection with the following descriptionl and the concluding claims, will set out the parts and combinations of parts which distinguish be tween what is old and what is claimed as new. Y The screenis of the character in which the mesh surface is formed of adjustable pivoted vslats to meet the requirements of different kinds and conditions of grain, so that a `suitable adjustment of the slats will change their inclination, and thereby increase or diminish the openings between v them to suit different kinds or sizes of grain and to control the volume of the air-currents directed upward between the Slat-fingers, so that a single shaking-screen may be adapted for use in the same machine for diierent kinds of grain. For this purpose my improvements are directed to the form and to the construction of the fingered slats and to the provision whereby they may be adjusted, and in these particulars the novel features will'be set out in the following description.

The sieve structurey embodying these im-4 provements is illustratedin the accompanying drawings in top viewin Figure 1. Fig. 2 shows in vertical longitudinal section the forward end part of the screen. Fig. 3 shows enlarged, in vertical section,that part of the 'screen having the connections whereby the screen-slats are adjusted to close or to vary the size of the openings -between the slats.

Fig. V/ishows in sectional detail the concavo' convex toothed form of one of the slats at that edge at which the opening is formed between the slats. of the fingered slats is mounted on the top frame-bar fixed mediately of the width of the frame. Fig.` 6 is a detail in cross-section of the-top frame-bar, the contiguous parts of the transverse slats, and the provision for connecting and adjusting the transverse slats.

Fig. 5 shows the way in which one;

Fig. 7 is a top view of the thu mb-nut by which the adjustment of the slats is made. Fig. 8 is one ot the sheet metal slats in transverse section, showing its doubled lnounting form and the surface edge groove between the in` gers. Fig. 9 is a detail in top view of the fingered edge of the Slat, showing where the hollow surfaces are formed between the iingers at the edge of the slat.

The screen is designed especially for sepa- 4 rating the chaff and coarse matter which.

usually comes from the first separation onto the cleaning-screen, and forsuch purpose the construction is especially advantageous in preventing the undue passage of the grain or small seeds when the slats are closed, or nearly so, to give effective direction to the wind-blast and a good surface for carrying straws, weeds, and other coarse material over the screen.

The frame is of rectangular form and for use is mounted in the well-known manner for a reciprocating endwise movement. A bar l, inediately ofits width,supplements the frame, while the screening-surface is formed of transverse sheet-metal slats loosely mounted on rods in the side bars and connected to the under side of the mediate bar, so that their suri'ace-forming parts lap, and at such lap ping the mesh-openings are formed for the., `passage of the grain. 1 These slats are of peculi iar construction, `their. edges. formed with fin` openings between the-slats are closed for certain kinds of grain and to facilitate the movement of coarse stuit over them, such closing being formed by the ends of the lingers of one slat resting on the back of the adjacent forward slat, back of its lingers. The trans- ICO versely-convex form of the fingers promotes j the side rolling of the grain off between them,

while the concave formation of the edge of the slat, between the fingers, forms a series of surface grooves 5, Fig. 8, at the base of and between the convex formation of the fingers to promote the free movement of the grain toward the edge of the slat. The transverse form of the slat is also peculiai` in that its surface from its pivoting-rod (i is convex lon- `szitudinally to the ends of the fingers and in the line thereof, as in Fig. 8, and its pivoted mounting on the transverse rod is formed by lapping or doubling the slat at 7, with its edge freely clasping said pivot-rod as a sleeve on the wind side of the slat, which being iliade of sheet metal is easily so formed. In like manner the lower edge of each slat is freely bent around a transverse rod 8, forming a sleeve whereby all the slats are connected to a longitudinal bar 9, through which the rods 8 pass, thereby freely suspending said rod 9, and when lifted or lowered has the effect to close or to open the fingers of each slat with relation to the upper surface of the contiguous slat to adjust them to give more or less width of opening between the slats or to close the fingers upon the slats. This construction for freely mounting the sheet-metal slats is important in rendering them stiff lengthwise, giving them a well-supported construction in which the sheet-metal fingers are very much increased in their stiffness, With a minimum weight. The slat doubled transversely renders it easy to make and to mount, for the mounting-rods need only to be passed through the sleeves formed by the lapped or doubled under part, so that these connections are permanent. Vhile the sheetmetalfingers formed as described giveastrong construction, the separating-surface formed thereby offers the least resistance when opened for the movement of the coarse stuff. The provision whereby the slats are adjusted consists of a bar 9, freelysuspended by the rod 8, transversely passed through the sleeves formed by the doubled lower parts of the sheetmetal slats,a link 10, pivotally connecting this suspended bar toa bolt 1l, passing up through the mediate bar, a nut 12 on the upper end of the bolt, and a plate-spring detent 13 on the bar engaging recesses 14, Fig. 7, in the upper surface of the nut as a means for locking it, when by turning the nut the freely-suspended bar is thereby raised or lowered, causing the transverse rocking of the loosely-mounted slats on their fixed pivot-rod G, and thus set the slat-fingers nearer to or farther from the convex slat-surface. The nut is preferably located in a stepped or recessed part of the mediate bar near the forward end of the screen, so that the plate-spring in its engagement with the nut extends on a levelwith the top of said bar over its recessed part, and thereby offers no impediment to the movement of the coarse stuff over the screen. A convenient way of making the nut is seen in Figs. 6 and 7, wherein its upper surface is seen as provided with notches 14 and the plate-detent 13 formed to engage them, as in Fig. 3. A keeperof two plate-sections 15 engages a groove in the nut; as a convenient means of securing it in place, while the pivotaly connection of the bolt-head with the link 10 prevents the bolt from turning. In this adjustment provision the freely-suspended bar is the important feature whereby the adjustment of all the fingered slats is rendered easyand convenient, while with the link 10 and bolt connection with the mediate bar the slats are securely held to their set relation. Looking at Figs. 3 and 3, it will be seen that while the slat parts 17 are straight to give the proper direction to the upward air-currents between the fingered slats the overhangng sloping finger part convex in cross-section and the surface grooves 5 at the base of the fingers give satisfactory results in connection with the adjustable capacity of the slats for the different requirements for different grain. In Figs. 2 and 3 it is seen that it is the freelysuspended bar 9 that permits theuse of the vertical link and its pivotal connection with the vertical adjustingbolt as the means whereby the screen-slats are set to suit the kind of grain.

I claim- 1. In a grain-separating screen and in combination with a frame, of fingered slats pivotally mounted therein the fingers and the slats having a construction giving to the ngers a forward and downward curve and a convex transverse form extending back of the edges of the slats, the latter being concave at the edges between the fingers giving an undulating formation along said slat edges and means IOO whereby the slats are adjusted to open and to close the openings between the fingered edges of the adjacent slats.

:2. In a grain-separating screen and in combination with a frame, a screening-surface composed of transverse parallel slats pivotally mounted in said frame having fingers curving forwardly and downwardly, of transverse convex form, the slats between the fingers having surface grooves 5 running. back from the edge of the slat.

3. In a grain-separating screen and in combination with a frame, a screening-surface composed of transverse parallel slats pivotally mounted in said frame having fingers curving forwardly and downwardly, the depending portion of each slat doubled or lapped on itself forming sleeves thereby, a pivotforming bar 6 on which one of said sleeves is mounted, rods 8 passed through the other sleeve, a freely-suspended bar mounted on said rods and means whereby said freely-suspended bar is raised and lowered.

et. In a grain-separating screen and in combination a frame, metal slats each doubled or lapped about half its width forming a sleeve, fingers curving forward from said sleeve and of convex transverse form, the convexity extending baek of the fingered edge and the latter concave between the fingers, a pivotforming bar on which said slat-sleeves are mounted and means connecting the lapped TIO ends of the slats for adjusting the fingered edges Of the adjacent slats.

5. In a grain-separating screen and in combination a frame, metal slats, each having ngers curving forward and grooves at its edge between the fingers extending back from the fingered edge, a xed pivot-forming bar On which each slat is loosely mounted and means connecting the slats for adjusting the openings between the fingered and concave edges Of adjacent slats.

6. In a grain-separating screen and in combination a frame provided with a mediate bar, slats pivotaliy mounted in said frame having fingers curving forward so that the Openings between the slats will be formed be- CHARLES CLOSZ.

Witnesses:

A. E. H. JOHNSON, A. ROLAND J OHNsON.