Patent ID: 7891055

Claim:
A pin for a door hinge, said hinge having two hinge leaves assemblable to form a butt hinge, each leaf having knuckles complementarily spaced apart to permit alignment of the knuckles on a common longitudinal axis, each of said knuckles being roll-formed and defining an open pin chamber that is elliptical in transverse cross-section and having oppositely disposed, inner surfaces, wherein the pin includes a cylindrical shank, a head at a free end of the pin, and a collar intermediate the head and the shank, said collar having a diameter larger than the diameter of the shank, and the shank has a pair of bulges for each of the knuckles, said bulges adapted to contact inner surfaces of a pin chamber when the pin is inserted through aligned knuckles of the leaves, said bulges of each pair being oppositely disposed and oppositely directed, such that when a leaf is rotated about the pin from a closed hinge position to an open hinge position, the bulges force apart the oppositely disposed, inner surfaces of each pin chamber contacted by the bulges.