Electromagnetic relay

Claim 1

IN A MAGNETIC DEVICE, IN COMBINATION A MOVABLE MEMBER INCLUDING A MAGNETICALLY-ATTRACTABLE ELEMENT; MEANS INCLUDING A MAGNETIC DEVICE FOR ATTRACTING SAID ELEMENT ACROSS AN AIR GAP DIMINISHED PROGRESSIVELY BY DISPLACEMENT OF SAID MEMBER FROM A DESIRED NORMAL POSITION, SAID MAGNETIC DEVICE HAVING A PREDETERMINED MAGNETIC-FORCE DISPLACEMENT CURVE WHICH IS A FUNCTION OF THE DISPLACEMENT OF SAID MOVABLE MEMBER UNDER THE URGENCE OF THE MAGNETIC FORCE EXERTED ACROSS SAID GAP BY SAID MAGNETIC DEVICE; AND SPRING MEANS HAVING A DYNAMIC CHARACTERISTIC APPROXIMATING SAID PREDETERMINED CURVE AND NORMALLY BIASING SAID MOVABLE MEMBER TO SAID DESIRED NORMAL POSITION RELATIVE TO THE MAGNETIC DEVICE, SAID SPRING MEANS COMPRISING A LEAF SPRING OF ELONGATED CHARACTER FIXED AT ONE END AND HAVING ITS OPPOSITE END PROJECTING INTO SPACE AN LATERALLY WIDENED PREDETERMINED AMOUNTS RELATIVE TO SAID ONE FIXED END FOR THE PURPOSED AFORESAID; TOGETHER WITH ADJUSTABLE MEANS PROVIDING A FULCRUM POINT ENGAGED BY SAID OPPOSITE PROJECTING END OF THE SPRING AND CAUSING THE LATTER TO CHANGE ITS CHARACTERISTIC PROGRESSIVELY IN ACCORDANCE WITH SAID CURVE RESPONSIVE TO FLEXURE THEREOF WITH MOVEMENT OF SAID MOVABLE MEMBERS BY SAID MAGNETIC DEVICE AS SAID AIR GAP IS DIMINISHED.