DIPPER STICK AND DIPPER STICK MANUFACTURING METHOD

摘要

A high strength polymeric composite material dipper stick comprises a structure including an outer casing member formed of high strength polymeric composite materials, an inner fillter comprising polyurethane foam disposed inside the outer casing member in order to be integrated with the outer casing member, and a plurality of bushing holders made of polymeric composite material and disposed at connecting portions of the structure in order to be integrated with said structure. The invention provides weight reduction of about 50-60 % in comparison with a conventional structural steel dipper stick, and also about 6.8-13.9 % in comparison with the conventional structural steel dipper stick on the basis of weight ratio of excavated earth.