US 3666277 A
An elastomeric V-shaped seal strip for sealing between the edge of a material separating screen and a supporting side wall includes apertures which extend through the apex of the V to receive shafts of screen tensioning bolts. The shafts substantially bisect the angle formed between the diverging legs of the V to provide equal tensioning pressure for each leg. A concave sealing surface extending longitudinally along the length of the seal strip where the legs merge serves to seal against the edge of the screen. Convex sealing surfaces on the distal ends of the legs serve to seal against the side wall. The flexing butterfly shaped seal strip bridges the gap between the screen and side wall and allows tightening or loosening of the tensioning bolts without leakage of material from above the screen around its edges.
Description (OCR text may contain errors)
United States Patent Hubach et al.
 EDGE SEAL STRIP FOR A TENSION SCREEN  Inventors: Louis E. Hubach, Aurora; Edgar E.
Hardner, Willoughby, both of Ohio 52 user ..277/166,85/1JP,140/108, 160/378, 209 402, 209/403, 209/408, 277/205 51 Int.Cl ..B65d53/00,F16j15/00 5s FieldotSearch ..216/166,189,205;209/402,
[ 51 May30,1972
3,219,065 1 1/1965 Moeller ..209/403 FOREIGN PATENTS OR APPLICATIONS 549,969 1/1957 Belgium ..209/402 Primary ExaminerHouston S. Bell, Jr. Attorney-Fay, Sharpe & Mulholland [5 7] ABSTRACT An elastomeric V-shaped seal strip for sealing between the edge of a material separating screen and a supporting side wall includes apertures which extend through the apex of the V to receive shafts of screen tensioning bolts. The shafts substantially bisect the angle formed between the diverging legs of the V to provide equal tensioning pressure for each leg. A concave sealing surface extending longitudinally along the length of the seal strip where the legs merge serves to seal against the edge of the screen. Convex sealing surfaces on the distal ends of the legs serve to seal against the side wall. The flexing butterfly shaped seal strip bridges the gap between the screen and  References cued side wall and allows tightening or loosening of the tensioning UNITED STATES PATENTS bolts without leakage of material from above the screen around its edges. 1,296,275 3/1919 Firth ..85/1JP 2,566,777 9/1951 Schmidt ..277/189 5 Claims, 5 Drawing Figures PAIENTEOmao I972 SHEET 1 BF 2 FIG. 2
INVENTORS. LOUIS E. HUBACH 6 EDGAR E GARDNER 4W 5W ZMJ/xolland ATTORNEYS BACKGROUND OF THE INVENTION This is a division of our co-pending application for a Tensioned Screen With Seal, Ser. No. 786,670, now US. Pat. No. 3,557,953.
Machines for separating grain from fines are old in the art. A typical combination includes a plurality of decks of superposed screens and a separate grain inlet for each screen at the entrance end thereof. Each deck includes a porous screen mounted above a non-porous pan. Grain flows from the inlet onto the screen and as it progresses, the fines fall through the screen onto the pan while the whole grains remain on the screen.
Disposed at the discharge end of the screen and pan is a deflecting baffle to deflect the separated grain to one side and the fines or foreign matter to the other side so that each deck will discharge its separated materials into separate vertically extending chutes.
Unfortunately, a plurality of problems arise in existing separators which make separation of the materials difficult and cause the prior art devices to be inadequate for the desired degree of clean grain required by modern standards. One of the problems is that the sealing devices along the edges of the screens have been inadequate to keep the grain from flowing into the lower pan section. The instant invention has overcome this problem by providing a resilient seal of unique design for engaging the walls along the edges of the screen.
BRIEF DESCRIPTION OF THE INVENTION The seal includes an elongated strip of elastomeric material for abutting a substrate. The strip is substantially V-shaped in cross-section and the projecting legs of the seal taper uniformly to greater widths as they converge toward the base of the V. The extremities of the V-shape serve as plural sealing surfaces. A plurality of apertures extend perpendicularly through the apex of the V to receive bolts which hold the seal strip in operative position.
The grain separating combination of the screen, tensioning means for the screen and the seals at each side edge of the screen is assembled in the following arrangement; a screen for separating grain is held taut between two walls of a vibrating apparatus; hook strips are formed as longitudinal pockets to receive the two side edges of the screen adjacent the walls; the hook strip is then folded to provide a clamping action on the screen edges; extending through the hook strip and the screen are a plurality of aligned apertures which in turn are aligned with the apertures in the seal strips and openings through the walls; and threaded T-bolts extend through the aligned apertures. Conventional nuts are threaded onto the shank of the T- bolts which extend through the walls. To make the screen more taut, one need only tighten the nuts on the various T- bolts against the walls. The seal strip is designed to sealingly conform to the shape of the outer edge of the hook strip and to project into flexing sealing engagement with the side wall of the screening apparatus.
It is an object of this invention to provide a seal having a concave sealing surface and including at least two convex sealing surfaces thereon.
It is another object of this invention to provide a seal having a concave surface facing the side wall of a vibrating apparatus and located between a screen and the wall.
It is another object of this invention to provide a seal with an aperture therethrough for receiving an anchoring means such as a T-bolt.
It is another object of this invention to provide in combination a screen suspended between two walls, a V-shaped seal between the walls and the screen and means for tensioning the screen.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatic view of a box and shaker apparatus in which the invention is incorporated;
FIG. 2 is a fragmentary elevational view showing the incorporation of the screen member in the plurality of decks in the box;
FIG. 3 is a cross-sectional elevational view in section of the tensioning means for the screen;
FIG. 4 is a modification of FIG. 3; and
FIG. 5 is an exploded view of the seating tensioning combination comprising the invention.
PREFERRED EMBODIMENT in grain separating apparatus as shown in FIG. 1, a multideck separator incorporating this invention is indicated generally at 10 and includes two boxes or housings l2 and 14. An eccentrically mounted shaker or vibrator means 16 is disposed between the housings and a plurality of resilient mountings 18 at the comers support the vibrating apparatus.
Disposed within each housing as illustrated in FIG. 2, are a plurality of screening decks indicated generally at 22. Each deck includes a screen 24 and a pan 26 with upturned edges 25. Wooden spacer bars 27 extending the length of the screen are provided as needed. The means for vibrating 16 causes any grain deposited on he screen to be agitated whereby small grains, foreign matter and pieces of broken grain will pass through the pores of the screen and fall on the pan 26.
As best seen in FIGS. 3, 4 and 5, the screen is held in tension between the side walls of the vibrating apparatus by a plurality of T-bolts 28. While T-bolts are described and preferred, L shaped bolts may be used satisfactorily. The edge of the screen 24 is confined in a pocket 30 formed by a hook strip element 32. After the screen is received in the pocket 30, the hook strip is folded to crimp the screen 24 therein.
Aligned apertures 34 and 36 in the hook strip and screen, respectively circumscribe the T-bolt 28 which includes a cross piece 40 and a threaded shank portion 42. The shank extends through the screen and hook strip apertures 34 and 36, respectively. It further projects through an aperture 44 in the side wall 46 into threaded engagement with a lock nut 47 and a tensioning nut 48 which clamp a washer 49 against the side wall.
Because it is undesirable to have the whole grains on the upper portion of the screen passed to the pan 26 during the vibrating and shaking operation, an elastomeric seal strip 50 is provided at each edge of the screen. The seal strip is substantially V-shaped in cross-section with the legs of the V tapering uniformly to greater widths as they converge inwardly toward the apex of the V and at their outer ends they terminate in rounded sealing surfaces 52. The rounded surfaces 52 allow for easier translation along the wall 46 when the screen is tightened or loosened.
The merging of the legs of the V at its apex includes a concave sealing surface 56 which is shaped to conform to the edge of the hook strip 32. The concave surface 56 is best seen in FIG. 5 and its confomiing shape is best illustrated in FIGS. 3 and 4. As can be seen, when nuts 47 and 48 are tightened the bolt 28 will push the seal strip 50 toward the upturned edge 25 on the pan and the side wall 46. Because the seal strip 50 is symmetrically arranged about the shank 42 of the bolt, tightening of the nuts will uniformly increase the sealing effectiveness of the seal strip; the legs of the strip will open wider and push harder against the wall and this in turn will cause the concave sealing surface 56 to scissor into a tighter grip on the edge of the screen 24. It is obvious that without the symmetrical design which provides equal and opposite forces within the seal it would not be as effective as it is in this application. Thus, the unique butterfly design provides superior sealing, compared to other designs on the market.
It should be noted that each of the three curved sealing surfaces 56 and 52 has an axis and that the three axes are substantially parallelly aligned along the seal strip. In addition, the axes of the apertures 58 through the strip extend substantially perpendicular to the axes of the sealing surfaces. It is intended that the apertures 58 intersect the concave sealing surface 56 whereby the aperture axes and the sealing surface axis intersect. Differently stated, intersecting planes which pass through the axis of the concave sealing surface and one of the axes of one of the convex sealing surfaces define an angle, which angle is substantially bisected by the axes of the apertures 58. This feature insures the aforementioned symmetrical forces within the seal strip.
While the method of forming the seal strip is immaterial to this invention, it could be thought of as two similar or mirror image elastomeric strips joined along one end to form a concave sealing surface for sealing against the separator screen.
Each distal end of each of the joined strips includes a convex sealing surface for sealing against the supporting wall.
The drawings show the outer extremities of the seal 50 engaging the upturned edges 25 of the pan. This is the preferred embodiment. But, notwithstanding the unitary nature of the preferred embodiment, the upturned edges 25 may be eliminated if desired and the seal 50 may directly contact the vertically extending side wall or substrate 46 of the housing 12. Such elastomeric strips 50 could also be provided between the pan 26 and the substrate 46. In the embodiments illustrated, an aperture 57 through the upturned edge 25 is aligned with the hook strip and wall apertures.
Extending through the V-shaped seal 50 and perpendicular to the apex of the V is an aperture 58 which circumscribes the T-bolt. The legs of the seal strip straddle the wall opening 44 and in this manner help to prevent any outside foreign matter from being incorporated in the cleaned grain or separated fines on the pan from escaping the boxes 12 and 14. The improved benefits of the sealing apparatus are easily seen by observing FIGS. 3, 4 and 5. The V-shape of the seal allows for adjustment of the T-bolt for greater tensioning or for loosening, while the extreme ends of the V-shaped seal strips still engage and seal against the walls. The easy flexing of the elastomeric material allows for less stringent manufacturing tolerances as to the width of the screen and the crimping and folding of the hook strip.
FIG. 4 shows a modification of the shape of the hook strip. The preference as to shape usually depends upon the particular material to be separated. In FIG. 3 the edge 60 of the hook strip extends above the cross piece 40 of the T-shaped bolt, while in FIG. 4 the fold of the hook strip material places the edge 62 below the cross piece.
For ease of description the principles of the invention have been set forth in a single embodiment. It is not intended that the illustrated embodiment nor the terminology employed to describe it be limiting. One having ordinary skill in the art will be aware of several modifications within the spirit of this invention. Rather it is intended that any restrictions on the invention be limited only by the appended claims.
The invention claimed is:
1. An elongated elastomeric seal strip for use in screening and material separation machines, said strip being designed for location between the sidewall of the machine and the edge of a screen within the machine, the screen being placed in tension by bolts projecting from the screen through the sidewall where nuts are tightened to regulate said tension, said seal strip being designed to prevent material located above the screen from passing below the screen without passing through the pores thereof by the locations of one sealing surface for engaging the screen edge and two sealing surfaces for engaging the sidewall, the seal strip comprising,
an elongated substantially V-shaped strip with three sealing surfaces, one sealing surface being on the outer surface of the apex of the V and the other two being at the extreme ends of the two legs,
the inner and outer surfaces of each of the legs converge toward the extreme ends, said extreme ends being rounded in a smooth convex curve connecting the converging inner and outer surfaces, said rounded extreme ends comprising two said sealing surfaces,
the sealing surface at the apex for sealing against the screen edge com risingl a smooth concave groove extending the length of t e se strip, said groove being located symmetrically with respect to the V-shape and the thickness of the seal strip at the bottom of the groove being less than the thickness of either leg immediately adjacent the groove.
2. The seal strip of claim 1 including a plurality of apertures through the seal strip, said apertures being adapted to receive the bolts and being substantially perpendicular to said groove.
3. The elastomeric seal strip of claim 1 wherein each of the three sealing surfaces defines a smooth curve having an axis, the three axes being substantially parallel to each other,
each a erture having an axis substantially perpendicular to the axis of the concave sealing surface.
4. The elastomeric seal strip of claim 1 wherein the axes of said apertures substantially bisect the angle formed by two intersecting planes, each plane passing through the axis of the concave sealing surface and the axis of one of the convex sealing surfaces.
5. The seal strip of claim 2, wherein the diameter of the apertures is less than the width of the groove.
UNITED STATES PATENT OFFICE I CERTIFICATE OF CORRECTION Patent No. 3, 77 Dated y 3 97 Inventor(s) Louis E. Hubach 8t Ell It is certified. that error appears in the above-identified patent and that said Letters Patentare hereby corrected as shown below:
On the cover sheet  the name of the inventor "Edgar E. Hardner" should read Edgar E. Gardner Signed and sealed this 7th day of November 1972 (SEAL) Attest:
EDWARD M.FLETCHER,JR. ROBERT GOITSCI-LALK Attesting Officer Commissioner of Patents ORM PO-105O (10-69) USCOMM-DC BO376-P69 U.S, GOVERNMENT PRINTING OFFICE: 1959 D365-334.