Patent ID: 7243593
Filing Date: 2007-07-17
Classification: E02F,Y10S

Abstract:
1. A hydraulic cylinder comprising: (a) a barrel comprising a barrel first end and a barrel second end, the barrel first end comprising a back cap having an extension port and a retraction port, and the barrel second end comprising a gland; (b) a ram having a ram first end and a ram second end, the ram first end comprising a large piston wherein the large piston is sized to slide within the barrel; (c) a center line having a center line first end, a center line second end, and an internal conduit, the center line first end provided attached to the back cap and providing fluid communication between the retraction port and the internal conduit, and the center line second end comprising a small piston wherein the small piston is sized to slide within the ram; and (d) an extension area between the back cap and the large piston, wherein the extension area is in fluid communication with the extension port; (e) a retraction space comprising a center line retraction space and a ram retraction space, wherein the center line retraction space and the ram retraction space are provided in fluid communication with the internal conduit.