Patent ID: 8813313

Claim:
A spring biased floor-mounted door hinge, comprising: a generally tubular housing having a splined peripheral wall; an elastomeric spring positioned within the tubular housing; a tracking member in contact with an upper end of the elastomeric spring and having outwardly projecting teeth that engage the splined peripheral wall of the housing to prevent relative rotation therebetween, the tracking member having a cam follower on an upper surface; a cam having a lower cam surface that engages the cam follower of the tracking member, the cam further having structural features on an upper surface; and a pin having a lower surface with protrusions that engage the structural features on the upper surface of the cam to prevent relative rotation therebetween, the pin having an upward extension with a non-circular shape that provides a keyed engagement with a similarly-shaped cavity on a lower edge of a door, wherein rotation of the door rotates the pin, which in turn rotates the cam and causes interaction between the lower cam surface in the cam follower of the tracking member, thus forcing the tracking member downward and compressing the elastomeric spring.