Door fastener

Claim 1

In a portable door fastener of the type suitable to partially insert into the latch space of the door lock to lock a horizontally swinging door in closed position against its associated jamb, the combination of a slide body comprising a length of thin, strong material, said body including at least one forward gripper projection adapted to insert into the latch space; a socket rearwardly affixed to the body in spaced relationship to the gripper, said socket including an integral, threaded section; a pressure plate adapted to slide relative to the body, said pressure plate comprising a door contacting surface; and an operating bolt longitudinally movable through the socket, said operating bolt being adapted to forwardly carry the pressure plate in a rotative connection, said operating bolt comprising threaded and unthreaded portions, the unthreaded portion being adapted to move rapidly through the socket to either push the pressure plate toward the door or to pull the pressure plate away from the door, the threaded portion of the operating bolt being adapted to engage in the threaded section of the socket to urge the pressure plate against the door by utilizing the mechanical advantage of the screw threads, the threaded portion of the operating bolt being positioned at the bolt end which extends away from the pressure plate and the unthreaded portion of the operating bolt being positioned at the bolt end which forwardly carries the pressure plate, whereby the door fastener may be rapidly applied to and removed from a door for locking and unlocking purposes.