Abstract: This door lock provides for locking a door securely from the inside, and it consists primarily of a lock housing, which is slidable on a lock plate. The lock plate includes an integral pin, which is placed in an anchor plate that is fastened secure, to the threshold of the door. The device includes, on its interior, a spring-loaded push-bar and a locking pin, for rendering the lock housing secure to the door and lock plate, and it further includes a recessed set screw to hold the locking pin secure, in the event a would be intruder breaks a glass in a door provided with such, in order to push the push-bar for releasing the lock.