Grain cleaning device

Claim 1

IN COMBINATION, A GRANARY HAVING A CLOSABLE UPPER END, A CONVEYOR MEANS HAVING ITS UPPER END POSITIONED ABOVE SAID CLOSABLE UPPER END, AN INCLINED GRAIN CLEANING MEANS HAVING ITS UPPER END OPERATIVELY SECURED TO THE UPPER END OF SAID CONVEYOR MEANS AND ITS LOWER END COMMUNICATING WITH THE INTERIOR OF SAID CLOSABLE UPPER END, SAID GRAIN CLEANING MEANS INCLUDING A SCREEN MEANS AND A FAN MEANS FORCING AIR UPWARDLY THROUGH SAID SCREEN MEANS, SAID GRAIN CLEANING MEANS ALSO INCLUDING A SCREEN FRAME MEANS HAVING UPPER AND LOWER ENDS, SAID SCREEN FRAME MEANS COMPRISING A PAIR OF ELONGATED, SPACED APART SIDE BOARDS AND UPPER AND LOWER ENDS MEMBERS EXTENDING BETWEEN SAID SIDE BOARDS, SAID SCREEN MEANS COMPRISING A TOP SCREEN MEANS SECURED TO SAID SIDE BOARDS AND EXTENDING THEREBETWEEN ALONG THE LENGTH THEREOF AND A BOTTOM SCREEN MEANS BELOW SAID TOP SCREEN MEANS EXTENDING BETWEEN SAID SIDE BOARDS, SAID FAN MEANS POSITIONED BELOW SAID BOTTOM SCREEN MEANS AND FORCING AIR THROUGH SAID BOTTOM SCREEN MEANS AND UPWARDLY THROUGH SAID TOP SCREEN MEANS, SAID BOTTOM SCREEN MEANS HAVING MEANS OPERATIVELY CONNECTED THERETO ADAPTED TO SHAKE SAID BOTTOM SCREEN MEANS, A FIRST BRACE MEANS PIVOTALLY SECURED AT ONE END TO SAID LOWER END MEMBER, AN UPSTANDING BRACE MEANS SECURED AT ONE OF ITS ENDS TO THE OTHER END OF SAID FIRST BRACE MEANS AND OPERATIVELY DETACHABLY SECURED AT ITS OTHER END TO SAID UPPER END MEMBER WHEREBY THE SLOPE OF SAID TOP AND BOTTOM SCREEN MEANS MAY BE VARIED.