Automatic mail box signal

Claim 1

AN AUTOMATIC SIGNAL DEVICE FOR USE WITH A MAIL BOX OF THE TYPE INCLUDING A HOUSING, A SWINGABLE DOOR ATTACHED AT ONE END OF THE HOUSING AND A FLANGE ON PORTIONS OF THE MARGIN OF THE DOOR OVERLYING THE HOUSING IN SPACED RELATIONSHIP THERETO COMPRISING: A LEAF SPRING OF GENERAL L SHAPE IN THE UNSTRESSED CONDITION THEREOF, A SIGNAL PLATE SUBSTANTIALLY RIGIDLY ATTACHED TO THE FREE END OF ONE OF THE LEGS OF THE L-SHAPED SPRING, THE OTHER LEG OF THE L-SHAPED SPRING, IN THE INSTALLED POSITION OF THE SIGNAL DEVICE, BEING SUBSTANTIALLY RIGIDLY ATTACHED ADJACENT ITS FREE END TO SAID HOUSING WITH SAID SIGNAL PLATE AND SAID ONE LEG EXTENDING SUBSTANTIALLY PARALLEL TO THE PLANE OF SAID DOOR IN THE UNSTRESSED CONDITION OF SAID SPRING, AND SAID OTHER LEG EXTENDING GENERALLY PERPENDICULAR TO THE PLANE OF SAID DOOR, THE LEGS OF SAID SPRING BEING JOINED ON A GENTLY CURVED RADIUS, A LATCHING MEMBER RIGIDLY ATTACHED ON SAID PLATE AND INCLUDING A LATCHING LEG EXTENDING IN A DIRECTION GENERALLY TRANSVERSE THE LINE OF JUNCTURE OF THE LEGS OF SAID L-SHAPED SPRING, THE FREE END OF SAID LEG BEING OF A SIZE TO FIT INTO THE SPACE DEFINED BETWEEN SAID HOUSING AND SAID FLANGE, SAID LEG BEING DISPOSED ON