Patent ID: 8430436

Claim:
An anti-ligative ergonomic doorknob system for a hinge-mounted door, said system comprising: a door-lock mechanism having a rotary-shank defining a central axis configured to move a latchbolt between latched and unlatched positions, the latchbolt has a tri-beveled outer terminus; a fixed escutcheon-plate mounted to the door, and defining a circular annular-recess with a central opening; a doorknob having a circular backing plate positioned within the annular recess and having an integral grasping knob extending from the backing plate, the rotary shank is connected to one end of the knob; a plurality of radially tapered fins extending between the knob and the backing plate, that will form an I-shaped, Y-shaped, or a X-shaped fin configuration as viewed outwardly from the central axis, wherein a spaced area is provided between continuous fins and the backing plate that is configured to accept means to push or grab a fin surface to operate the rotary shank to unlatch the door lock mechanism, each tapered fin has a minimum 40-degree radial slopingly outer surface as measured tangentially relative to the central-axis, the sloping outer surface of each fin and the tri-beveled outer terminus of the latchbolt are configured to prevent frictional ensnarement of a cord when placed on or around the doorknob or on or around the latchbolt or in a configuration that uses an upper surface, side surface, bottom surface of the door in conjunction with the doorknob or the latchbolt, preventing a user from suicide.