Inertial responsive stop signal for vehicles

Claim 1

APPARATUS FOR SIGNALLING THE ACT OF STOPPING A VEHICLE HAVING BRAKES, COMPRISING A FIRST PENDULUM PIVOTALLY MOUNTED ON A SECOND PENDULUM WHICH IS PIVOTALLY MOUNTED ON THE VEHICLE, EACH PENDULUM BEING MOUNTED TO SWING FREELY ABOUT A SUBSTANTIALLY HORIZONTAL AXIS WHICH IS SUBSTANTIALLY AT RIGHT ANGLES TO THE STRAIGH-LINE DIRECTION OF MOTION OF THE VEHICLE; MEANS TO FIX THE POSITION OF THE SECOND PENDULUM IN RESPONSE TO APPLICATION OF THE BRAKES OF THE VEHICLES; A FIRST NORMALLY-CLOSED SWITCH RESPONSIVE TO MOTION OF THE FIRST AND SECOND PENDULUMS, SAID SWITCH MOVING TO OPEN POSITION WHEN THE CENTER OF GRAVITY OF THE FIRST PENDULUM IS DISPLACED FORWARD THROUGH A SUBSTANTIALLY GREATER ANGLE REALTIVE TO THE PIVOTAL AXIS OF THE FIRST PENDULUM THAN THE ANGLE THROUGH WHICH THE CENTER OF GRAVITY OF THE SECOND PENDULUM IS DISPLACED FORWARD RELATIVE TO THE PIVOTAL AXIS OF THE SEOND PENDULUM; A NORMALLY-OPEN SECOND SWITCH SERIALLY CONNECTED TO THE FIRST SWITHC; MEANS CONTROLLING SAID SECOND SWITCH IN RESPONSE TO THE APPLICATION OF VEHICLE BRAKES FOR MOVING THE SECOND SWITCH TO CLOSED POSITION; AND ELECTRICALLY ACTUATED SIGNALLING MEANS CONTROLLED BY SAID SWITCHES AND GIVING A SIGNAL WHEN THE FIRST AND SECOND SWITCHES ARE BOTH CLOSED.