Safety radiator pressure caps

Claim 1

IN A SAFETY RADIATOR PRESSURE CAP FOR USE WITH AN AUTOMOBILE RADIATOR FILLER NECK HAVING A RETAINER LIP, A PRESSURE VALVE SEAT AND AN OVERFLOW VENT BETWEEN SAID LIP AND SAID SEAT, A CAP BODY PROVIDED WITH MEANS ENGAGEABLE WITH SUCH A LIP TO RETAIN SAID CAP BODY IN CLOSING ASSOCIATION WITH SUCH A NECK, A GENERALLY-CYLINDRICAL SUPPORT FIXEDLY DEPENDING FROM SAID CAP BODY, PROVIDED AT ITS DISTAL END WITH STOP MEANS AND FORMED WITH A PAIR OF DIAMETRICALLY OPPOSED, LONGITUDINAL SLOTS, A PRESSURE VALVE HAVING AN INTURNED FLANGE LOOSELY SLEEVED ON SAID SUPPORT BETWEEN SAID STOP MEANS AND SAID CAP BODY FOR LIMITED BODILY RECIPROCATION TOWARD AND AWAY FROM SAID CAP BODY, SPRING MEANS INTERPOSED BETWEEN SAID CAP BODY AND SAID VALVE AND CONSTRUCTED AND ARRANGED RESILIENTLY TO PRESS SAID VALVE INTO SEALING ENGAGEMENT WITH SUCH A SEAT WHEN SAID CAP BODY IS SO RETAINED, A STEM RECIPROCABLY PENETRATING SAID CAP BODY AND HAVING AN INNER PORTION DISPOSED WITHIN SAID SUPPORT AND AN OUTER PORTION DISPOSED OUTSIDE SAID CAP BODY, SAID STEM BEING PROVIDED WITH ABUTMENT MEANS ON ITS INNER PORTION, A YOKE SLIDABLY MOUNTED ON SAID STEM BETWEEN SAID ABUTMENT MEANS AND SAID CAP BODY AND WITHIN SAID SUPPORT, SAID YOKE BEING PROVIDED WITH OPPOSITELY-PROJECTING FINGERS RESPECTIVELY PENETRATING SAID SLOTS FOR COOPERATIVE ENGAGEMENT WITH THAT SURFACE OF SAID FLANGE REMOTE FROM SAID CAP BODY, A LEVER, PIVOT MEANS TRANSAXIALLY CARRIED BY THE OUTER PORTION OF SAID STEM, ONE END OF SAID LEVER BEING PIVOTALLY MOUNTED ON SAID PIVOT MEANS, SAID ONE LEVER END BEING FORMED TO PROVIDE A CAM SURFACE COMPRISING A FIRST PORTION WHICH EXTENDS GENERALLY IN THE DIRECTION OF LENGTH OF SAID LEVER AND A SECOND PORTION WHICH EXTENDS GENERALLY TRANSVERSE TO THE LENGTH OF SAID LEVER, SAID SECOND CAM PORTION BEING MORE REMOTE FROM SAID PIVOT MEANS THAN IS SAID FIRST CAM PORTION, THE PARTS BEING SO PROPORTIONED AND ARRANGED THAT, WHEN SAID CAP BODY IS SO RETAINED AND THE OTHER END OF SAID LEVER IS CLOSELY ADJACENT SAID CAP BODY, SAID FIRST CAM PORTION WILL ENGAGE SAID CAP BODY AND SAID VALVE WILL BE RESILIENTLY PRESSED AGAINST SUCH A SEAT, BUT WHEN SAID OTHER LEVER END IS MOVED AWAY FROM SAID CAP BODY, SAID SECOND CAM PORTION WILL ENGAGE SAID CAP BODY TO LIFT SAID VALVE BODILY OFF SUCH SEAT AND TO HOLD SAID VALVE AND SAID OTHER LEVER END IN THEIR ELEVATED POSITIONS.