Patent ID: 7509709

Claim:
A hinge, comprising: an elongated body having two ends; a mounting tab perpendicularly formed on one of the ends of the body and having a pivoting hole formed through the mounting tab; and a receiving slot formed longitudinally through the body and having a length; a pivoting member mounted rotatably on the body and having a mounting portion; and a pintle mounted rotatably through the pivoting hole of the body and being non-circular in cross section; a first positioning element movably mounted on the pintle of the pivoting member and having a rear surface; a front surface; a bottom; a groove formed inclinedly in the front surface of the first positioning element at an angle relative to the body; and a plank protruding from the bottom of the first positioning element and being received in the receiving slot of the body; a second positioning element mounted on the pintle of the pivoting member and having a rear surface corresponding to the front surface of the first positioning element; a front surface; an engaging hole formed through the second positioning element, being non-circular in cross section and engaging with the pintle; and a rib formed diametrically on the rear surface and corresponding to and selectively engaging with the groove in the first positioning element to retain the pivoting member at an angle based on the inclined groove; and a resilient element mounted around the pintle and having a first end abutting the rear surface of the first positioning element and pushing the first positioning element toward the second positioning element.