Patent ID: 6098824
Filing Date: 2000-08-08
Classification: B66C

Abstract:
A telescopic boom section for a crane, comprising:an upper longitudinal section having a substantially flat top wall and two side walls extending longitudinally and downwardly from opposite edges of the top wall; anda lower longitudinal section having a convexo-concave wall, said wall having a convex exterior surface, a concave interior surface, a bottom region and two longitudinal edges, said two longitudinal edges of said lower longitudinal section being affixed to corresponding edges of said side walls of said upper longitudinal section such that the concave interior surface of said lower longitudinal section and said top and side walls of said upper longitudinal section define a cavity therewith, said lower longitudinal section including a series of arcuate segments having offset centers of radii, said series of arcuate segments being disposed adjacent one another and sequentially across the lower longitudinal section along a curved path to thereby form the concave interior surface of said convexo-concave wall.