Patent ID: 8646206

Claim:
A system of presence detection in a door assembly, comprising: a door frame, wherein said door frame defines an opening; a door mounted in said opening, wherein said door is allowed to operate from open to closed position with respect to said door frame; a hinge system located between said door frame and said door; a presence sensing arrangement comprising a first sensor pair, a second sensor pair, and a third sensor pair which allows detection of the presence of an object along surfaces of said door, door frame, hinge system; or the upper and lower surfaces of said door and door frame in either an open or closed position of said door, and during the movement of the door from open to closed position of said door, and irrespective of the pressure said object exerts against said door, hinge system, or said door frame; wherein said first sensor pair is located on an outer surface of said door; wherein said second sensor pair is located on said door frame, and said third sensor pair located on a bottom surface of said door in a gap between the ground and the door; wherein said first sensor pair comprises a first transmitter and a first receiver located a distance apart and forming a first sensing path between said first transmitter and said first receiver; wherein said second sensor pair comprises a second transmitter and a second receiver located a distance apart and forming a second sensing path between said second transmitter and said second receiver, said sensing path aligned with a space between said upper surface of said door and said door frame, approximately parallel with said upper surface of said door; wherein said third sensor pair comprises a third transmitter and a third receiver located a distance apart and forming a third sensing path between said third transmitter and said third receiver, said third sensing path aligned approximately parallel with said bottom surface of said door; wherein each of said first transmitter, said second transmitter, said third transmitter, said first receiver, said second receiver, and said third receiver are placed in a protective sheath housing member; wherein said protective sheath housing member has an outer body shape forming a non-ligature surface defined by one or more acute angles along said outer body shape, said protective sheath housing member comprising an aperture; and wherein said second transmitter and said second receiver are placed on said door frame such that said second sensing path is uninterrupted by said hinge system, said door, said first sensor pair, or movement of said door in a direction towards either of said second transmitter or said second receiver.