Patent ID: 6164468
Filing Date: 2000-12-26
Classification: B66C

Abstract:
A guidance actuator assembly for laterally positioning and fixng the telescopic sections of a boom, said sections including inner and outer telescopic sections, an improvement in the actuator assembly comprising:a cylinder tube having an open end, said cylinder tube being mounted within the inner telescopic section, the open end extending through the inner telescopic section into proximity with a bearing assembly on the outer telescopic section;a piston reciprocally movable in the tube, the piston having an actuator end extendible through the open end of the tube into contact with the bearing assembly on the outer telescopic section for positioning the telescopic sections relative to each other; anda chamber in said tube, said chamber containing an incompressible fluid therein;said bearing assembly including a planar surface area parallel to an opposed planar surface on the actuator end of the piston, the respective planar surfaces areas being positioned parallel to directions of maximum deformation forces on the telescopic sections.