Patent ID: 7096536

Claim:
A hinge apparatus comprising: a first hinge part having a first mounting plate and first and second side plates; a second hinge part having a second mounting plate and third and fourth side plates, said third and fourth side plate being disposed between said first and second side plates; and a hinge pin assembly extending between said first, second, third and fourth side plates and permitting relative pivotal movement of said first and second hinge parts about an axis of rotation defined by said hinge pin assembly; said hinge pin assembly comprising: a pin having a flat sided shank portion, a head and a threaded end, said head disposed adjacent one of said first and second side plates and said threaded end received in the other of said first and second side plates, said pin being fixed with respect to a longitudinal direction of the axis of rotation extending between the first and second side plates; a first cam plate on said pin and associated with one of said first hinge part and said second hinge part for rotation therewith, said first cam plate having a first contoured surface; a second cam plate having a flat sided axial opening disposed on said flat sided shank portion on said pin and associated with the other of said first hinge part and said second hinge part for rotation therewith, said second cam plate having a second contoured surface disposal against said first contoured surface; said first and second cam plates being disposed between said third and fourth side plates; and biasing means urging said first and second contoured surfaces into cooperative engagement; wherein said first and second contoured surfaces are configured and arranged to create a plurality of dwell points such that said first and second hinge parts can be held in a plurality of positions between open and closed positions.