Bistable magnetic pressure indicator

Claim 1

IN A DEVICE HAVING A CASING MEMBER AND A WALL MEMBER MOUNTED FOR MOVEMENT RELATIVE THERETO AND COOPERATIVELY ENGAGEABLE THEREWITH TO DEFINE SEPARATE REGIONS ON OPPOSITE SIDES OF THE WALL MEMBER, SAID WALL MEMBER BEING RESILIENTLY YIELDABLY SHIFTABLE FROM A NORMAL POSITION RELATIVE TO SAID CASING TO TRAVERSE A MOVEMENT PATH IN RESPONSE TO VARIATIONS IN EFFECTIVE DIFFERENTIAL FORCE ACTING ON SAID SIDES, AN INDICATOR ARRANGEMENT COMPRISING A BISTABLE REPULSING MAGNET ASSEMBLY COMPRISING FIRST MAGNET MEANS MOUNTED IN SHIFTABLE RELATION UPON SAID CASING MEMBER TO UNDERGO TRAVEL IN A DIRECTION ALONG SAID PATH AND A SECOND MAGNET MEANS FASTENED TO SAID WALL MEMBER IN SUBSTANTIALLY SYMMETRICAL RELATION TO SAID FIRST MAGNET MEANS BUT NORMALLY OFFSET THEREFROM IN A DIRECTION ALONG SAID PATH AND ADAPTED TO INTERACT MAGNETICALLY THEREWITH AND URGE THE SAME IN THE DIRECTION OF OFFSET, AND A NORMAL POSITION LIMIT STOP MOUNTED ALONG SAID CASING MEMBER AND ENGAGEABLE WITH SAID FIRST MAGNET MEANS TO DEFINE A NORMAL OFFSET POSITION WHEREIN THE FIRST MAGNET MEANS IS INTERMEDIATE OF SAID STOP AND SAID SECOND MAGNET MEANS.