Patent ID: 6405531
Filing Date: 2002-06-18
Classification: B66C,B66F

Abstract:
A jack comprises:a first oil cylinder, an inner cylinder disposed in the first oil cylinder, an upper cover covering the first oil cylinder and the inner cylinder, a piston and a piston rod inserted in the inner cylinder, the piston connected to the piston rod, the piston rod passing through the upper cover, an extended plate extending from the upper cover, a collar disposed on a bottom of the extended plate, a second oil cylinder inserted through the collar, the second oil cylinder having a lower enlarged neck and an inner chamber, a push rod inserted through the inner chamber of the second oil cylinder, an arm plate connected to the collar, a retainer connected to the push rod, a lever fastening a connector and the retainer together, a handle rod connected to the connector, the connector having a slot for receiving the arm plate, a pivot pin fastening the connector and the arm plate together, and an oil pipe disposed between the first oil cylinder and the inner cylinder.