Patent ID: 8549707

Claim:
A hinge including first and second hinge members movable between an open position and a closed position, the first hinge member including a substantially cylindrical body portion having a longitudinal axis about which the second hinge member is rotatable to move the hinge between the open position and the closed position; the body portion housing biasing means having an end fixed relative to the second hinge member, the biasing means is in engagement with an adjustment member, the adjustment member is fixed with respect to the first hinge member; the adjustment member includes a ratchet means to move the adjustment member in a first direction to increase the tension in the biasing means; wherein the ratchet means includes a plurality of asymmetric teeth, each of the teeth having a first inclined face which is adapted to slide in the first direction over one or more stops located on the internal surface of the body portion, and a second face which is engageable with any one of the stops to fix the position of the second end of the biasing means relative to the first hinge member; the adjustment member includes a tool-engaging surface shaped to receive a complementarily shaped tool for moving the adjustment member in the first direction and a tool-receiving portion containing the tool-engaging surface, the tool-receiving portion is detachably engaged with a tooth portion which includes the asymmetric teeth, the tool-engaging surface is a recess, the recess having an inner diameter and a base, the base including an aperture through which a pushing force is applied to disengage the tooth portion from the stop or stops to release the ratchet means.