Hydraulic rock fracturing device

A rock fragmentation device comprising:

• a shaft having a hollow length therethrough for the passage of a pressurized fluid, and a plurality of feed apertures for delivery of the pressurized fluid, said shaft further comprising a feed inlet for receiving said pressurized fluid from a hydraulic system;
• and
• a plurality of expandable members each having an inner diameter dimensioned to receive the shaft therein, the plurality of expandable members being positioned on the shaft in fluid tight engagement effective for receiving said pressurized fluid via said feed apertures without discharging fluid to an exterior thereof;
• wherein the expandable members are expandable, upon filling with said pressurized fluid, to sufficient dimensions to fragment a rock when fitted inside a cavity formed therein;
• wherein each of the plurality of expandable members comprise:
• a molded elastic rubber tube including sidewalls, a top wall, and a bottom wall, each of the top wall and the bottom wall having a central aperture, the central aperture having a diameter for receiving the shaft therein;
• a plurality of disk members, each disk member comprising a central aperture dimensioned to receive the shaft, at least one disk member of said plurality of disk members positioned on either side of the molded elastic rubber tube and sealed onto the molded elastic rubber tube;
• and
• a joint seal molded into each of the top wall and the bottom wall of the elastic rubber tube, sealing the central aperture of the top wall and the bottom wall to the shaft.