Armature mounting means for electromagnetic relay

Claim 1

IN AN ELECTROMAGNETIC DEVICE OF THE TYPE DESCRIBED, THE COMBINATION OF A MAGNETIC FRAME MEMBER COMPRISING TWO FLAT LEGS PROJECTING AT RIGHT ANGLES TO EACH OTHER, THE FREE END OF ONE OF SAID LEGS PRESENTING TWO ALIGNED, TRANSVERSELY SPACED BEARING EDGES DIRECTED AWAY FROM THE OTHER OF SAID LEGS; AN ELECTROMAGNET COMPRISING A CORE, AN ENERGIZING WINDING SURROUNDING SAID CORE AND ADAPTED TO BE ENERGIZED BY ALTERNATING CURRENT, AND A SHADING COIL, SAID CORE BEING FIXED TO SAID OTHER LEG, EXTENDING PARALLEL TO SAID ONE LEG, AND HAVING AN EXPOSED END SLOTTED TO PRESENT AT LEAST FIRST AND SECOND POLE PORTIONS, SAID SHADING COIL ENCIRCLING ONE OF SAID FIRST AND SECOND POLE PORTIONS, WHEREBY SAID ONE POLE PORTION PRESENTS A SHADED POLE FACE; AN ARMATURE PIVOTALLY ENGAGED WITH SAID BEARING EDGES AND ARRANGED FOR PIVOTAL MOVEMENT BETWEEN AN ACTUATED POSITION, IN WHICH SAID ARMATURE EXTENDS AT LEAST SUBSTANTIALLY PARALLEL TO SAID OTHER LEG AND ENGAGES ONLY SAID SHADED POLE FACE OF SAID CORE, AND AN UNACTUATED POSITION, IN WHICH SAID ARMATURE IS DISENGAGED FROM SAID CORE; A PAIR OF RESTORING SPRINGS EACH ATTACHED AT ONE END TO A POINT ON SAID ARMATURE ADJACENT A DIFFERENT ONE OF SAID BEARING EDGES, SAID SPRINGS BEING SPACED APART BY A DISTANCE SUBSTANTIALLY EQUAL TO THE SPACING BETWEEN SAID BEARING EDGES, SAID SPRINGS EXTENDING GENERALLY ALONG SAID ONE LEG; AND MEANS CARRIED BY SAID FRAME MEMBER AND ANCHORING THE OTHER ENDS OF SAID RESTORING SPRINGS TO MAINTAIN SAID SPRINGS IN TENSION TO URGE SAID ARMATURE AGAINST SAID BEARING EDGES AND BIAS SAID ARMATURE PIVOTALLY TOWARD SAID UNACTUATED POSITION, ENGAGEMENT OF SAID ARMATURE WITH SAID SHADED POLE FACE AND SAID TWO SPACED BEARING EDGES PROVIDING THREE-POINT SUPPORT FOR SAID ARMATURE WHEN SAID ARMATURE IS HELD IN SAID ACTUATED POSITION BY ENERGIZATION OF SAID ELECTROMAGNET, SAID FREE END OF SAID ONE LEG HAVING A SHALLOW NOTCH BETWEEN SAID BEARING EDGES, WHEREBY CONTACT BETWEEN SAID ONE LEG AND SAID ARMATURE IS LIMITED TO SAID BEARING EDGES.