Patent ID: 7159290

Claim:
A manual hydraulic riveter comprising: a body, said body holding a fluid cylinder, a fluid tank and a hydraulic cylinder; a first piston mounted in said fluid cylinder and movable between two opposite ends of said fluid cylinder; a lever pivoted to said body and adapted to move said first piston in said fluid cylinder between the two opposite ends of said fluid cylinder, said lever having one end coupled to said first piston in said fluid cylinder; a first fluid pipe connected between said fluid cylinder and said hydraulic cylinder; a first check valve mounted in said first fluid pipe; a second fluid pipe connected between said fluid tank and said hydraulic cylinder; a second check valve mounted in said second fluid pipe; a third fluid pipe connected between said hydraulic cylinder and said fluid tank; a relief valve mounted in said third fluid pipe; an actuating rod mounted in said body and axially movable and rotatable relative to said body, said actuating rod having a front end extending out of said body and holding a riveting unit; a second piston fixedly mounted on said actuating rod in said hydraulic cylinder and movable between two opposite ends of said hydraulic cylinder; and spring means mounted on said actuating rod inside said hydraulic cylinder and stopped between one end of said hydraulic cylinder and said second piston to impart a forward pressure to said second piston.