HYDRAULIC GRIPPER FOR DERRICK JACK 

Hose Gripper Jacks used a bladder that, when pressurized, force steel clamps against the upper and lower surfaces of the edges of the skid beam flange, locking the gripper into place on the beam. The jacking cylinder was then pressurized to push or pull the load. Hose Gripper Jacks were particularly suitable where exceptionally wide jacking beams are involved.