Patent ID: 7739871

Claim:
A press-driven hydraulic power device for hydraulically powering a tool actuator, including: a pump including a pump piston disposed in a pump cylinder for pressurizing hydraulic fluid therein; an accumulator in fluid communication with the pump cylinder, and including an accumulator piston disposed in an accumulator cylinder that houses hydraulic fluid on one side of the accumulator piston; and a body supporting the hydraulic pump and hydraulic accumulator thereon and being in fluid communication between the pump and accumulator cylinders, and including a pressure relief valve downstream of the pump cylinder and upstream of the accumulator cylinder, and further including a check valve downstream of the accumulator cylinder and upstream of the pump cylinder, and further comprising a plunger assembly including a bearing and seal assembly carried in an open end of the pump cylinder, and a rod carried in the bearing and seal assembly and adapted to be actuated by a press ram to displace the pump piston.