Patent ID: 8789617

Claim:
A hydraulic pick, comprising: a monolithic supporting housing including: a first portion and a second portion, a piston rod, a piston, a striking pin, a working tool, and an inlet and an outlet for supply of liquid, said piston rod and said piston being fixedly positioned in said supporting housing, a movable valve ring being provided on said piston rod, said striking pin being movably provided on said piston rod and slidingly received in a bushing, at least a portion of said piston rod being located within a portion of said striking pin, said piston rod having a pressure transformer's piston movably connected thereto, said working tool being provided in said second portion of said supporting housing, said working tool being slidingly received in at least one tool bushing, a gas chamber being defined between the supporting housing, the pressure transformer's piston, and the striking pin, a pressure transformer's cylinder and equalizing chamber being defined between the piston rod and the pressure transformer's piston, and a connecting channel being provided between the gas chamber and the equalizing chamber.