EXCAVATOR HAVING WORKING DEVICE COMPOSED OF COMPLEX MATERIAL

摘要

PURPOSE: An excavator is provided to have a light working device and to have the working device to be easily produced. CONSTITUTION: A boom is separated to five parts, three of them are formed by steel and the rest two is formed by a complex material. Because a curved part is hard to be composed of the complex material, the part of the boom contained the curved part is composed of the steel. The curved part to connect the boom and a body is formed by the steel, a connected straight part is formed by the complex material, a part(7) contained a pivot point(5) and an arm cylinder fixed the boom cylinder by bending downward is formed by the steel, and an end(11) of the boom is formed by the steel again. An arm is separated to three parts. A part(15) pivoted with the boom and fixed a bucket cylinder is formed by the steel, a straight part(17) connected in the part(15) is formed by the complex material, and a part(19) connected with the straight part(17) and to fix a bucket(21) is formed by the steel again. Thereby every complex or curved parts are designed by the steel, and only the straight part is formed by the complex material Therefore, a working device is lightened without a problem by a new material or without changing a design.