Antitheft central lock system for a motor vehicle

A central door-lock system comprising:

• a plurality of door latches each including
• a detent displaceable between an open position securing the respective door to the respective doorpost and a closed position permitting the respective door to separate from the respective doorpost,
• a manual door-opening handle,
• mechanism including a primary latch member connected to said handle and connectable to said detent and movable between a lock position preventing said handle from displacing said detent between said open and closed positions and an unlock position permitting said handle to displace said detent between said open and closed positions, and
• means connected to said mechanism and including a secondary latch member displaceable between a lock position urging said primary latch member into the respective lock position while permitting said primary latch member to move into the respective unlock position, an unlock position permitting said primary latch member to move freely between the respective lock and unlock positions, and an antitheft position positively holding said primary member in the respective lock position;
• respective servoactuators for said latches each including
• an operator linearly displaceable between lock, unlock, and antitheft positions,
• an actuator element entrainable by the respective operator, connected to the respective secondary latch member, and jointly displaceable therewith between the respective positions, and
• means including a reversible electric servomotor and a rack-and-pinion gear train connected between said motor and the respective operator for displacing the respective secondary latch member via the respective actuator element and operator between the respective lock, unlock, and antitheft positions;
• and
• means including a central switch connected to said servomotors for operating same jointly and thereby jointly displacing said secondary latch members between the respective positions.