Patent ID: 6119795
Filing Date: 2000-09-19
Classification: B25D

Abstract:
A hydraulic hammer including a piston-receiving cylinder having an upper an upper and a lower portion, an inner surface, and an outer surface, a movable piston installed within the cylinder for upward and downward movement, said cylinder including a passage formed in said lower portion between said inner and outer surfaces for passing a pressurized fluid therethrough, said cylinder including a longitudinally arranged hydraulic groove in fluid communication with said passage, said hydraulic groove formed in said inner surface so as to be in fluid communication with said passage, said hydraulic groove defined by an upper and lower portion extending respectively above and below said passage by an equal extent, said lower portion having a distal, first groove radially cut into said cylinder and a second groove radially cut into said cylinder, said second groove disposed between said passage and said first groove, said upper portion of said hydraulic groove having a third groove radially cut into said cylinder, the improvement comprising:a sealing system comprising a wiper disposed within said first groove for preventing dirt from entering between said piston and cylinder;a first seal ring disposed within said second groove; anda second seal ring disposed within said third groove, each of said seal rings for guiding said piston during movement, thereby preventing piston contact against said inner surface of said cylinder, said second seal ring for moving fluid from said passage into said hydraulic groove during movement of said piston.