Automatic locking device for automobile door

An automatic locking device for an automobile door comprising:

• an ignition key switch for detecting a presence and absence of a key;
• an actuator operative to lock the automobile door when electrically energized;
• a door switch operated to a first state at times when the door is open and operated to a second state at times when the door is closed;
• first and second relay means;
• first circuit means responsive to the operation of the door switch to said first state at times when said key switch detects the absence of the key for operating said first and second relay means to a first state and responsive to the operation of said door switch to said second state for operating said first and second relay means to a second state;
• said first relay means being operative from said first to said second state during a time period greater than the time period for the operation of said second relay means from said first to said second state upon operation of said door switch for momentarily placing said first and second relay means in a different one of said first and second states;
• and
• second circuit means operative to electrically energize said actuator to lock said door at times when said second relay means is in said first state and said second relay means is in said second state.