Brake mechanism for small induction motors

Claim 1

AN AUTOMATIC BRAKE MECHANISM FOR SMALL INDUCTION MOTORS, PARTICULARLY OF THE SHADED POLE TYPE WHICH, UPON DE-ENERGIZING THE FLUX-PRODUCING WINDING, IS AUTOMATICALLY RELEASED AND CAUSED TO ENGAGE A PORTION OF THE ROTOR, SAID MECHANISM COMPRISING IN COMBINATION: (A) A BRAKE LEVER ARM HAVING A HEAD PORTION CARRYING A BRAKE SHOE AND A TAIL PORTION EXTENDING ALONG THE STATOR FRAME OF SAID MOTOR AND TERMINATING IN A FERROMAGNETIC PLATE, (B) A STUD EXTENDING FROM SAID STATOR FRAME OVER WHICH SAID BRAKE LEVER IS FULCRUMED FOR MOVEMENT OF SAID HEAD PORTION TOWARD SAID ROTOR FOR ENGAGEMENT WITH A PORTION THEREOF, (C) A SPRING BIASING SAID LEVER ARM IN A DIRECTION TO CAUSE MOVEMENT OF SAID ARM UPON EXPANSION OF SAID SPRING TOWARD AND INTO ENGAGEMENT OF THE BRAKE SHOE WITH SAID PORTION OF THE ROTOR, (D) SAID PORTION OF THE ROTOR COMPRISING A DISK OF RESILIENT MATERIAL FORMING AN EXTENSION OF SAID ROTOR, THE OUTER SURFACE THEREOF FACING SAID BRAKE SHOE, (E) A GAP IN SAID STATOR FRAME DEFINING SECONDARY MAGNETIC POLE PIECES PLACED OPPOSITE SAID FERROMAGNETIC PLATE FOR ATTRACTING SAID PLATE WHILE SAID MOTOR IS ENERGIZED, THEREBY HOLDING SAID LEVER ARM AGAINST THE FORCE OF SAID SPRING IN A POSITION PREVENTING SAID BRAKE SHOE FROM ENGAGEMENT WITH SAID RESILIENT SURFACE OF SAID ROTOR PORTION AND RELEASING SAID PLATE UPON COLLAPSE OF THE MAGNETIC FIELD WHEN SAID MOTOR IS DE-ENERGIZED, AND (F) SAID BRAKE SHOE HAVING SUCH CONFIGURATION AND ANGULAR MOVEMENT AS TO CAUSE PROGRESSIVELY GREATER FORCE OF ENGAGEMENT WITH THE RESILIENT SURFACE OF THE ROTOR DUE TO THE KINETIC ENERGY OF THE MOMENTUM OF SAID ROTOR, THEREBY EFFECTING SUBSTANTIALLY INSTANT STOPPING OF SAID ROTOR.