Door security apparatus

Claim 1

A security apparatus for preventing opening of a hinged door from the inward swinging side, said door being received in a door frame having a door facing on the outward swinging side of said door frame, said door including a door knob extending from the outward swinging side, said door knob having a shaft portion, comprising: a web portion having first and second, spaced ends; a first flange portion depending in a first direction from said first end of said web portion and generally transversely thereto; a second flange portion depending in a second direction from a second end of said web portion and generally transversely thereto, said second direction being substantially opposite to said first direction, said second flange portion having an inner surface, said inner surface facing in a direction toward an imaginery plane passing through said first flange portion transversely to said web portion; a lip portion depending from the end of said second flange portion distal said web portion, said lip portion extending in substantially the same direction as said web portion to thereby form a channel defined by said lip portion, said web portion and said second flange portion; engagement means on said first flange for selectively releasably engaging at least a portion of said door knob and selectively preventing substantial movement of said door knob away from said first flange whereby, when said door is closed and said engagement means engages said door knob on said outward swinging side, said door facing on said outward swinging side of said door frame is received in said channel, whereby pivoting of said apparatus relative to said shaft is restrained sufficiently to maintain said apparatus properly positioned with respect to said door and said door frame.