Back-up warning signal for automotive vehicles

Claim 1

IN A DEVICE OF THE CLASS DESCRIBED, A MOUNTING PLATE, A BELL, ANCHORING MEANS EXTENDING BETWEEN SAID MOUNTING PLATE AND THE CENTRAL PORTION OF SAID BELL AND RIGIDLY MAINTAINING SAID BELL IN SPACED OVERLYING RELATIONSHIP TO SAID MOUNTING PLATE, A STRIKER FOR SAID BELL, MEANS PIVOTALLY SECURING ONE END OF SAID STRIKER TO SAID MOUNTING PLATE WITHIN THE CONFINES OF SAID BELL FOR MOVEMENTS OF THE OPPOSITE END THEREOF TOWARD AND AWAY FROM STRIKING ENGAGEMENT WITH THE INTERNAL PERIPHERY OF SAID BELL, AN ELECTRIC MOTOR, MEANS SECURING SAID ELECTRIC MOTOR TO THE OPPOSITE SIDE OF SAID MOUNTING PLATE WITH ITS DRIVE SHAFT PROJECTING THERETHROUGH, CAM MEANS ON THE PROJECTED END OF SAID DRIVE SHAFT AND ENGAGEABLE WITH THE INTERMEDIATE PORTION OF SAID STRIKER TO MOVE THE FREE END THEREOF INTO BELL STRIKING ENGAGEMENT, SPRING MEANS YIELDING BIASING SAID STRIKER IN A DIRECTION AWAY FROM STRIKING ENGAGEMENT WITH SAID BELL, SAID MOUNTING PLATE PROJECTING LATERALLY OUTWARDLY IN ALL DIRECTIONS FROM THE PERIMETER OF SAID BELL, THE UPPER END PORTION OF SAID MOUNTING PLATE DEFINING A SEMI-CYLINDRICAL GUARD PLATE WHICH OVERLIES SAID BELL IN SPACED CONCENTRIC RELATIONSHIP TO SAID BELL AND SUBSTANTIALLY COVERING SAID BELL, SAID CAM MEANS COMPRISING A ROLLING CONTACT BEARING COMPRISING INNER AND OUTER ANNULAR RACES AND ROLLING ELEMENTS BETWEEN SAID RACES, SAID INNER RACE BEING MOUNTED ON SAID DRIVE SHAFT IN ECCENTRIC RELATIONSHIP TO THE AXIS THEREOF, SAID OUTER RACE HAVING AN OUTER PERIPHERAL SURFACE OPERATIVELY ENGAGING SAID STRIKER.