Door that becomes thief-proof and intruder-proof when the bell rings and we open its trap door protected by a fixed grating on the door with a special mechanism that, while the trap door is closed, prevents the door from being opened

摘要

The invention comprises a combination of a door that is opened and closed normally with a trap door in it and a grating fixed to the outside of the door that prevents strangers entering when we open the door for them to give us information, post or small parcels, and an original mechanism that as we open the trap door locks the door and unlocks it only when we close the trap door again. A beneficial characteristic of the invention is that, when we open the trap door to strangers who have rung the bell, if they threaten us with a pistol through the grating (bogus postmen, bogus policemen, etc.), they cannot get in because we cannot open the door for them because it is locked by the mechanism until the trap door is closed completely. IMAGE