Self-locking container cap

Claim 1

IN COMBINATION WITH A CONTAINER HAVING AN END WALL WITH AN UPSTANDING RIM PORTION PROVIDING A SHOULDER AND A WELL PORTION OUTWARDLY FROM SAID SHOULDER, A CAP FOR SAID CONTAINER HAVING AN ANNULAR TOP WALL, AN INTEGRAL SIDE WALL DEPENDING FROM THE OUTER PERIPHERY OF SAID TOP WALL AND BOTTOMED IN SAID WELL PORTION AT ONE END AND AN OPEN END SLEEVE DEPENDING FROM THE INNER PERIPHERY OF SAID ANNULAR TOP WALL AND INTEGRAL THEREWITH RECEIVING SAID RIM PORTION, SAID SLEEVE HAVING AN INTURNED FLANGE UNDERLYING SAID SHOULDER TO LOCK THE CAP ON THE CONTAINER, SAID ANNULAR TOP WALL HAVING A COUNTERBORE AROUND THE INNER PERIPHERY THEREOF PROVIDING A SHOULDER, A CLOSURE DISK SECURED IN SAID COUNTERBORE AND BOTTOMED ON SAID SHOULDER CLOSING THE OUTER END OF THE SLEEVE AND COOPERATING WITH THE SLEEVE TO FORM A THIMBLE CHAMBER, SAID SIDE WALL OF THE CAP HAVING AN ACCESS OPENING THERETHROUGH, AND SAID SLEEVE HAVING AN EXPANSION GAP ALIGNED WITH SAID ACCESS OPENING AND ADAPTED TO RECEIVE A PROBE TO EXPAND THE SLEEVE SUFFICIENTLY FOR UNSEATING THE INTURNED FLANGE FROM THE SHOULDER OF THE CONTAINER TO ACCOMODATE REMOVAL OF THE CAP FROM THE CONTAINER.