Snap action device

Claim 1

IN A SNAP ACTION DEVICE FOR CONTROL OF DIRECTIONAL SIGNALS OF AUTOMOTIVE VEHICLES OF THE TYPE WHEREIN A DEFORMED VANE OF RESILIENT CONDUCTING MATERIAL SNAPS BACK AND FORTH BETWEEN CIRCUITS CONTROLLING POSITIONS TO INTERRUPT THE FLOW OF CURRENT TO THE AUTOMOBILE SIGNAL LAMPS IN RESPONSE TO EXPANSION AND CONTRACTION OF A PULL RIBBON SECURED AT SPACED POINTS TO THE VANE, THE IMPROVEMENT WHICH COMPRISES AT LEAST ONE RIB FORMED IN THE VANE THE SAID RIB BEING CONCAVE RELATIVE TO ONE SURFACE OF THE VANE AND CONVEX RELATIVE TO THE SECOND OPPOSITE SURFACE OF THE VANE AND TAPERING IN AT LEAST ONE DIMENSION FROM A MAXIMUM ADJACENT THE PERIPHERY OF THE VANE TO A MINIMUM ADJACENT THE CENTRAL PORTION OF THE VANE TO PROVIDE A DEFORMATION IN THE VANE ALONG ONE AXIS WHICH BIASES THE VANE TO MAKE IT MONOSTABLE AND THEREBY CAUSE IT ALWAYS TO SEEK AND ASSUME ONE CIRCUIT CONTROLLING POSITION WHEN THE PULL RIBBON EXPANDS, SAID VANE SNAPPING TO A SECOND CIRCUIT CONTROLLING POSITION IN WHICH THE VANE IS CURVED ALONG AN AXIS ANGULARLY DISPOSED TO SAID FIRST AND AT OPPOSITE CURVATURE TO SAID FIRST DEFORMATION WHEN THE RIBBON CONTRACTS.