Abstract: The unlocking mechanism of the present invention is actuated as a result of contact with the door's existing lever. When an occupant rotates the door's lever, it not only retracts the door's latch, but the handle will also engage the unlocking mechanism of the present invention, the door lever engaging the unlocking mechanism. The door's lever follows the geometry of the cam thereby pushing the sliding bar of the unlocking mechanism thereby engaging a latch release. The latch release moves the locked lever of the door's deadbolt assembly and the deadbolt is retracted. When the door's lever is returned to its normal state, a spring pushes the sliding bar backward to the ready position. The latch release rotates to its ready position and the mechanism is ready for a subsequent activation.

Abstract: A door deadbolt device that can prevent a door from opening operates independently from the lockset installed on the door. The device is easily locked from the inside of the room with a one-handed motion using an insertable tool or key which may be carried separately or stored out of the reach of small children or unauthorized persons. The bolt is positioned so as to be pushed into a locking position under the tension of a spring, thereby easily and securely bolting the door. The present invention further allows the user to rapidly unbolt the door from inside the room also with a one-handed single motion. Optionally, the device can also be unbolted from the outside with a special tool.