Patent ID: 7451522

Claim:
A hinge having a positioning bracket having a side; and a sleeve formed in the side of the positioning bracket and having a through hole formed axially through the sleeve; and an elongating groove formed axially through the sleeve and communicating with the through hole; a rotating bracket and having a proximal end; a distal end; and a connecting segment protruding from the proximal end of the rotating bracket and having a mounting hole formed axially through the connecting segment; a pivotal pin attached to the rotating bracket and having a proximal end; a distal end; a mounting shaft formed on the proximal end of the pivotal pin and extending into the mounting hole of the connecting segment on the rotating bracket; a connecting shaft formed on the distal end of the pivotal pin, extending into the through hole of the sleeve on the positioning bracket and having an outer wall; and multiple annular grooves formed around the outer wall of the connecting shaft to contain lubricant oil inside; and a head formed on the pivotal pin between the mounting shaft and the connecting shaft and extending into the through hole of the sleeve on the positioning bracket; a washer mounted around the connecting shaft of the pivotal pin between the annular grooves and the head; a mounting ring mounted securely around the connecting shaft near the distal end of the pivotal pin; and two resilient sleeves mounted around and clamp the connecting shaft of the pivotal pin, mounted in the through hole of the sleeve on the positioning bracket, mounted between the washer and the mounting ring and each resilient sleeve having a sleeve segment mounted around the connecting shaft and having a distal end; a through hole formed axially through the sleeve segment and mounted around the connecting shaft; and a slot longitudinally formed in the sleeve segment and communicating with the through hole to make the sleeve segment resilient; and a mounting slice formed on the sleeve segment, adjacent to the slot and inserted into the elongating groove.