Abstract: A dock device having a bottom for supporting a ship or the like and longitudinal walls standing up from the bottom, a carriage adapted to be moved along a longitudinal wall, an arm pivotably and deflectably connected with the carriage, swinging and deflecting mechanism for moving the arm with respect to the carriage, a head carrying a processing member and being rotatably and tiltably connected with the free end of said arm and tilting and rotating mechanism for moving said head with respect to the arm. Horizontal and vertical guide wheels on the head are alternately actuated by setting mechanism connected with the head.

Abstract: A telescopic boom assembly including first and second telescoping members. The assembly employs rack and pinion telescoping mechanisms which are driven by hydraulically controlled piston and cylinder members. The combination provides positive and precise positioning of the telescoping members and extremely smooth movement thereof.