Cam operated closure

Claim 1

IN A CLOSURE STRUCTURE OF THE CLASS WHEREIN A CYLINDRICAL HUB IS ATTACHED TO A CONTAINER AND THE CYLINDRICAL HUB HAS A SIDE WALL AND A TOP WALL WITH AN OPENING THERE-IN, AND A CAP FITS OVER THE HUB AND HAS A SIDE WALL AND A TOP WALL ADJACENT TO THE CORRESPONDING WALLS OF THE HUB, AND THE CAP OSCILLATES ON THE HUB TO BRING AN OPENING THROUGH THECAP INTO REGISTER WITH THE OPENING THROUGH THE TOP WALL OF THE HUB, AND THERE ARE CAM MEANS ON THE CONFRONTING SIDE WALLS OF THE HUB AND CAP INCLUDING A CAM TRACK ON ONE OF THE WALLS AND CAM FOLLOWER ON THE OTHER OF SAID WALLS WITH THE CAM TRACK SHAPED TO PULL THE TOP WALLS TOGETHER WHEN THE OPENINGS THROUGH THE TOP WALLS ARE IN REGISTER AND WHEN THEY ARE SHIFTED OUT OF OVERLAPPING RELATION WIGH ONE ANOTHER, THE INTERMEDIATE PORTION OF THE CAM TRACK RISING PROGRESSIVELY AND THEN RUNNING DOWN AGAIN BETWEEN THE PORTIONS OF THE TRACK THAT PULL THE TOP WALLS TOGETHER, THE IMPROVEMENT WHICH COMPRISES, (A) A RESILIENT TOP WALL ON THE HUB HAVING A DOMED CONTOUR ACROSS THE CENTER PORTION OF THE TOP WALL, THE TOP WALL OF THE CAP BEING FLATTER THAN SAID CONTOUR, (B) THE CAM TRACK AND FOLLOWER BEING CORRELATED WITH THE HEIGHTS OF THE HUB AND CAP TO HOLD THE CAP DOWN ON THE HUB AND FLATTEN THE DOME-SHAPED CONTOUR FOR ALL POSITIONS OF THE FOLLOWER ALONG THE CAM TRACK, (C) THE CLOSURE STRUCTURE BEING ON A CONTAINER IN WHICH GOODS ARE SOLD AND THE OPENING IN THE HUB BEING ORIGI-NALLY CLOSED BY A PORTION OF THE HUB EXTENDING OVER THE AREA OF THE HUB IN WHICH THE OPENING IS TO BE MADE BY THE ULTIMATE CONSUMER, (D) THE TOP WALL OF THE HUB HAVING A DEPRESSED AREA AT THE LOCATION WHERE THE OPENING THROUGH THE TOP WALL OF THE HUB IS TO BE MADE, AND (E) THE CLOSURE STRUCTURE BEING APPLIED TO THE UPPER EDGE OF A CYLINDRICAL CONTAINER AND FORMING THE ENTIRE TOP OF THE CONTAINER.