A safety door, door lock and door lock release mechanism for preventing a child from opening a door while permitting an adult to do so includes a weight sensor and a height sensor for unlocking a locked door. An alarm is used to indicate a child's attempt to open the door and a sensor for sensing a dangerous...http://www.google.fr/patents/US7770326?utm_source=gb-gplus-shareBrevet US7770326 - Safety door, door lock and door lock release mechanism
Safety door, door lock and door lock release mechanism
