Safety automobile door locking device

Claim 1

IN AN AUTOMOBILE HAVING A DOOR FRAME, A DOOR AND AN IGNITION SWITCH, A SAFETY DEVICE FOR LOCKING SAID DOOR WHEN THE IGNITION SWITCH IS CLOSED, SAID SAFETY DEVICE COMPRISING A PAIR OF SIMILARLY CONSTRUCTED KEEPER MEMBERS INTERPOSED BETWEEN SAID DOOR FRAME AND SAID DOOR AND SECURED RESPECTIVELY THERETO IN REVERSELY ORIENTED POSITIONS, SAID KEEPER MEMBERS BEING PROVIDED WITH APERTURES WHICH ARE REGISTER WHEN THE DOOR IS CLOSED, A PROJECTABLE AND RETRACTABLE KEEPER PIN SLIDABLE IN SAID APERTURES, RESILIENT MEANS FOR URGING SAID PIN TO ITS RETRACTED POSITION, A HYDRAULIC CYLINDER MOUNTED IN SAID DOOR FRAME, A PISTON PROVIDED ON SAID KEEPER PIN AND SLIDABLE IN SAID CYLINDER, A HYDRAULIC MASTER CYLINDER HAVING A RECIPROCABLE PISTON ROD, A FLUID TRANSMITTING CONDUIT CONNECTING SAID HYDRAULIC CYLINDER IN SAID DOOR FRAME TO SAID MASTER CYLINDER, A SOLENOID INCLUDING A RECIPROCABLE ARMATURE CONSTITUTED BY SAID PISTON ROD OF THE MASTER CYLINDER, AND AN ELECTRIC CIRCUIT CONNECTING SAID SOLENOID TO SAID IGNITION SWITCH WHEREBY THE SOLENOID MAY BE ENERGIZED UPON CLOSING OF THE IGNITION SWITCH TO ACTUATE SAID MASTER CYLINDER AND THE DOOR FRAME CYLINDER TO PROJECT SAID KEEPER PIN AGAINST THE ACTION OF SAID RESILIENT MEANS.