Means for maintaining substantially atmospheric pressure inside sealed housings

Claim 2

A SILO FOR THE STORAGE OF FORAGE CROPS COMPRISING, A CONTAINER HAVING AN UPSTANDING WALL OF A CYLINDRICAL SHAPE, A COVER FOR ENCLOSING THE WALL AT THE TOP THEREOF AND HAVING A NORMALLY CLOSED, CENTRAL OPENING THEREIN FOR USE IN FILLING THE CONTAINER WITH THE CROPS, SAID COVER HAVING FURTHER A NORMALLY OPEN OPENING FORMED THEREIN SPACED RADIALLY OUTWARDLY FROM SAID INLET OPENING, SAID WALL HAVING A NORMALLY CLOSED OPENING NEAR THE BOTTOM THEREOF, A FLEXIBLE SHEET IMPERVIOUS TO AIR AND MOISTURE HAVING AN OUTER PERIPHERAL EDGE, AND SAID SHEET HAVING FURTHER AN OPENING CENTRALLY THEREOF TO FORM AN INNER PERIPHERAL EDGE, SAID INNER PERIPHERAL EDGE SECURED IN A SEALED MANNER COMPLETELY ABOUT THE PERIMETER OF SAID INLET OPENING, AND CLAMP MEANS SEALING SAID OUTER PERIPHERAL EDGE OF SAID SHEET COMPLETELY TO THE INTERIOR OF SAID WALL BELOW SAID INLET OPENING.

Claim 3

IN A CONTAINER FOR THE STORAGE OF FORAGE CROPS HAVING A NORMALLY CLOSED, CENTRAL INLET OPENING AT THE TOP THEREOF, AND HAVING A NORMALLY CLOSED DISCHARGE OPENING NEAR THE BOTTOM THEREOF, AND HAVING FURTHER A CHAMBER FORMED THEREIN FOR HOLDING A VARIABLE QUANTITY OF THE CROPS, APPARATUS FOR MAINTAINING SUBSTANTIALLY ATMOSPHERIC PRESSURE IN THE CHAMBER BETWEEN THE CROPS AND THE TOP OF THE INTERIOR OF THE CONTAINER, SAID APPARATUS COMPRISING, A CIRCULAR FLEXIBLE SHEET IMPERVIOUS TO AIR AND MOISTURE AND HAVING AN OPENING CENTRALLY THEREIN TO FORM AN INNER PERIPHERAL EDGE, SAID SHEET HAVING AN OUTER PERIPHERAL EDGE, SAID INNER PERIPHERAL EDGE SECURED IN A SEALED MANNER COMPLETELY ABOUT THE PERIMETER OF SAID INLET OPENING, SAID OUTER PERIPHERAL EDGE SECURED IN A SEALED MANNER COMPLETELY ABOUT THE INTERIOR OF SAID CONTAINER BELOW SAID INLET OPENING, AND AIR PASSAGE MEANS SECURED TO SAID CONTAINER AT THE TOP THEREOF AND SPACED FROM SAID INLET OPENING, SAID AIR PASSAGE MEANS ADAPTED TO TRANSMIT AIR BETWEEN THE EXTERIOR OF THE CONTAINER AND THE INTERIOR THEREOF BETWEEN SAID SHEET AND THE TOP OF SAID CONTAINER.

Claim 4

IN A CONTAINER FOR THE STORAGE OF FORAGE CROPS HAVING A NORMALLY CLOSED, CENTRAL INLET OPENING AT THE TOP THEREOF, AND HAVING A NORMALLY CLOSED DISCHARGE OPENING NEAR THE BOTTOM THEREOF, AND HAVING FURTHER A CHAMBER FORMED THEREIN FOR HOLDING A VARIABLE QUANTITY OF THE CROPS, APPARATUS FOR MAINTAINING SUBSTANTIALLY ATMOSPHERIC PRESSURE IN THE CHAMBER BETWEEN THE CROPS AND THE TOP OF THE INTERIOR OF THE CONTAINER, SAID APPARATUS COMPRISING, A CIRCULAR FLEXIBLE SHEET IMPERVIOUS TO AIR AND MOISTURE AND HAVING AN OPENING CENTRALLY THEREIN TO FORM AN INNER PERIPHERAL EDGE, SAID SHEET HAVING AN OUTER PERIPHERAL EDGE, SAID INNER PERIPHERAL EDGE SECURED IN A SEALED MANNER COMPLETELY ABOUT THE PERIMETER OF SAID INLET OPENING, SAID OUTER PERIPHERAL EDGE SECURED IN A SEALED MANNER COMPLETELY ABOUT THE INTERIOR OF SAID CONTAINER BELOW SAID INLET OPENING, AND AIR PASSAGE MEANS SECURED TO SAID CONTAINER AT THE TOP THEREOF AND SPACED FROM SAID INLET OPENING, SAID AIR PASSAGE MEANS ADAPTED TO TRANSMIT AIR BETWEEN THE EXTERIOR OF THE CONTAINER AND THE INTERIOR THEREOF BETWEEN SAID SHEET AND THE TOP OF SAID CONTAINER.