Helmet feedport

Claim 1

FOR A HELMET ADAPTED TO ENCAPSULATE THE HEAD OF THE WEARER SO AS TO BE PRESSURIZED, A COMBINED FEEDING AND PURGING MEANS, INCLUDING A CASING HAVING A PROJECTION EXTENDING FROM THE INSIDE OF THE OUTSIDE OF THE HELMET THROUGH AN OPENING THEREIN, AND DEFINING A THROUGH-PASSAGE PERMITTING ACCESS INTERNALLY OF THE HELMET, MEANS ATTACHED TO SAID PROJECTION FOR SECURING SAID CASING TO SAID HELMET, VALVE MEANS INCLUDING A VALVE ELEMENT MOVABLE BOTH ANGULARLY AND AXIALLY RELATIVE TO THE EXTERNAL END OF SAID THROUGH-PASSAGE AND PIVOTALLY MOUNTED TO SAID CASING, A SHAFT SECURED TO SAID VALVE ELEMENT EXTENDING INTO SAID HELMET AND ROTATABLE THEREWITH, A RADIALLY EXTENDING FLEXIBLE SEAL MEMBER ATTACHED TO THE INTERNAL END OF SAID SHAFT, SAID FLEXIBLE SEAL BEING ELONGATED AND HAVING A FLAT INNER SURFACE ADAPTED TO COVER THE INTERNAL END OF SAID THROUGHPASSAGE AND SUFFICIENTLY WIDE TO EXTEND OVER SAID INTERNAL END THROUGHOUT THE ENTIRE RANGE OF ANGULAR MOVEMENT WITH RESPECT TO THE ADJACENT OPENING OF SAID VALVE ELEMENT, AND AN APERTURE IN SAID MEMBER LOCATED WITH RESPECT TO THE ANGULAR MOVEMENT SUCH THAT IT ALIGNS WITH SAID THROUGH-PASSAGE WHEN SAID VALVE ELEMENT IS SPACED ANGULARLY FROM SAID THROUGH-PASSAGE.