Anti-ligative doorknob with tri-beveled latchbolt
An anti-ligative ergonomic type door-knob primarily of the institutional type, essentially serving to defeat the effort of a temporarily mentally-depressed room occupant from succeeding in committing self-hanging via contrived ensnaring by which to secure a cord like hanging-noose. Generic-variant embodiments of my anti-ligative doorknob are set forth, including both a circular and semi-circular escutcheon-plate for I-shaped V-shaped Y-shaped X-shaped fin-levers, and also a non-finned hemispherical iteration. The novel critical minimum approximate 40-degree anti-ligative principle of my LIFESTAR™ doorknobs reliably prevents a person ensnaring any heretofore problematically hazardous to portion of the door-knob assembly, while my optionally cooperating door latchbolt is formed to a matching critical minimum approximate 40-degree anti-ligative tri-beveled latchbolt as well. Further suicide-deterrence is achieved by effectively submerging the doorknob into the door escutcheon-plate, thereby leaving virtually no declivity by which a suicidal-person can secure any manner of self-inflicted hanging-cord.
1. An anti-ligative ergonomic doorknob system for a hinge-mounted door, said system comprising:
a lever having a rotary-shank connected to one end of the lever, the rotary-shank configured to move a latchbolt between latched and unlatched positions, the latchbolt having a tri-beveled outer terminus;
a fixed escutcheon-plate forming a partial-circle;
a backing plate extending from the lever; and
an annular-recess in the escutcheon-plate to prevent ensnarement of a cord under the backing plate;
a sloping outer surface of the lever and the tri-beveled outer terminus of the latchbolt 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.
2. The anti-ligative doorknob system of claim 1 , wherein the fixed escutcheon-plate forms a partial-circle of approximately 45-degrees to 180-degrees sector of a circle.
3. The anti-ligative doorknob system of claim 1 , wherein the lever has a minimum 40-degree radial slopingly outer surface as measured tangentially relative to a central axis of the rotary-shank.
4. The anti-ligative doorknob system of claim 1 , wherein the tri-beveled outer terminus has a minimum 40-degree radial slopingly outer surface as measured tangentially relative to a central-axis of the latchbolt.
5. The anti-ligative doorknob system of claim 1 , further comprising:
a retention-flange extending from the backing plate; and
a guide in the escutcheon-plate serving to positively retain the retention-flange within said escutcheon-plate as the lever rotates.
6. The anti-ligative doorknob system of claim 5 , wherein the guide comprises an annular-recess groove in the escutcheon-plate serving to positively retain the retention-flange within said escutcheon-plate as the lever rotates.
7. The anti-ligative doorknob system of claim 5 , wherein the guide comprises an undercut annular-recess in the escutcheon-plate serving to positively retain the retention-flange within said escutcheon-plate as the lever rotates.
8. The anti-ligative doorknob system of claim 1 , the lever further including a dished surface area to enable a person having no hands to operate the doorknob system.
9. The anti-ligative doorknob system of claim 1 , the lever further including a pivot-stop to limit the rotation of the lever.