Door security device

A door locking device for securing an in-swing door against forced entry, the in-swing door mounted to a door hinge supported by a door frame, the door supported on the door hinge for in-swing pivotal movement about a door hinge vertical axis between a door closed position abutting the door frame and a plurality of door open positions apart therefrom, the door having a lock stile opposite the door hinge, the door having a door body including a door interior surface facing the door frame, the door having a door exterior surface facing opposite the door interior surface, at the lock stile the door having a vertically elongated door outside edge extending in the vertical direction between the door interior surface and the door exterior surface in intersecting perpendicular relationship therewith, proximate the door hinge the door frame having an elongated first jamb extending in the vertical direction, proximate the door outside edge the door frame having an elongated second jamb extending in the vertical direction, the second jamb having an elongated second jamb interior surface extending in the vertical direction, in the door closed position the second jamb interior surface extending in corresponding parallel opposed relationship to the door outside edge, the second jamb having an elongated second jamb stopping surface extending in the vertical direction, the second jamb stopping surface intersecting the second jamb interior surface in perpendicular relationship therewith, the second jamb stopping surface thus defining a stopping projection adjacent the second jamb interior surface that terminates swinging travel of the door in the door closed position, in the door closed position along the door outside edge the second jamb stopping surface abutting the door exterior surface in corresponding parallel opposed relationship to same, said door locking device comprising:

• a mounting plate configured to be secured to the second jamb interior surface by a plurality of first threaded fasteners extending from said mounting plate into the second jamb;
• a first receiver top surface in a radial direction perpendicular to a first receiver aperture vertical axis having a first receiver top surface primary width between said first top surface inner edge and said first top surface outer edge which is a difference between a first receiver wall outer radius and a first receiver wall inner radius;
• a first receiver bottom surface disposed in spaced opposed relationship to said first receiver top surface, said first receiver wall comprising a uniform width from said first receiver top surface to said first receiver bottom surface, said first receiver bottom surface having a first receiver bottom surface primary width between a first bottom surface inner edge and first bottom surface outer edge which is said difference between said first receiver wall outer radius and said first receiver wall inner radius;
• said first receiver top surface comprising a first major rest spaced apart from said mounting plate major body, said first receiver comprising a declining slide surface and first locking channel between said first major rest and said mounting plate major body, said first major rest having a major rest height defining a maximum height of said first receiver wall;
• said first receiver top surface comprising a locking channel bottom wall located at substantially ninety degrees (90°) in relation to said first inner surface of said mounting plate major body, said locking channel bottom wall having a locking channel bottom height defining a minimum height of said first receiver wall;
• said first receiver top surface comprising a locking channel lower wall transition located at substantially ninety degrees (90°) in relation to said first inner surface of said mounting plate major body, said locking channel lower wall transition having a lower wall transition height defining a transition height of said first receiver wall;
• said first receiver top surface comprising a declining slide surface having an upper end intersecting said major rest at said major rest height, said declining slide surface having a lower end intersecting said locking channel lower wall at said lower wall transition height;
• said first receiver wall comprising said locking channel defined therein, said locking channel extending along a locking channel vertical axis, said locking channel comprising a locking channel major vertical wall opposite said locking channel minor lower wall, said declining slide surface and said locking channel minor upper wall, said declining slide surface at said lower wall transition introducing said neck portion of said second receiver into said locking channel defined therebetween, said locking channel comprising an open slot extending through said first receiver wall;
• said locking swing plate configured for pivoting movement about said hinge pin vertical axis between a locking angular position and unlocked angular position apart from said locking angular position, said locking swing plate in said locking angular position having a major blocking surface extending toward said door in a blocking attitude, said blocking attitude determined for said major blocking surface to engage the door interior surface when the door occupies closed position, said locking swing plate in said locking angular position being received in a locking channel of said mounting plate to limit pivoting movement of said locking angular position, said locking swing plate configured for translation movement along said hinge pin vertical axis between an uppermost vertical position and lowermost vertical position, said locking swing plate when simultaneously in the locking angular position and the lowermost vertical position being releasably fixed in lowermost locked position by cooperation of a locking channel major vertical wall and opposed locking channel minor lower wall of said locking channel located to prevent pivoting movement of said locking swing plate out of said locking angular position by obstructing said locking swing plate from pivoting movement about said hinge pin vertical axis when said locking swing plate is in said lowermost vertical position, in said lowermost locked position said major blocking surface in said blocking attitude located and oriented to abut said door interior surface in substantially perpendicular relationship to said first inner surface of said mounting plate, said locking swing plate positively biased by force of gravity for vertical translation movement to said lowermost position from said uppermost position when in said angular locking position, said locking swing plate positively retained in said lowermost position by the gravity biasing force to remain in fixed position in said locking channel in relation to said mounting plate in said lowermost locked position unless moved by manual intervention.