MULTISTAGE TYPE CABLE BEARING

PURPOSE:To stably use various kinds of codes and hoses and minimize the contracted length to the expanded length by designing an upper stage cable bearing in such a manner as to form the guide rail of a lower stage cable bearing, and connecting a plurality of cable bearings to an expansion boom. CONSTITUTION:Each cable bearing 5, 6 has a structure of supporting a supporter 1 for holding a cable between two chains 2a, 2a and 2b, 2b, and having fixed and moving end metal fittings on both the ends. The two cable bearings 5, 6 are connected to each other in such a manner that the fixed end metal fitting of the second cable bearing 6 is connected to the moving end metal fitting of the first cable bearing 5, and the first cable bearing 5 forms the guide of the second cable bearing 6. The cable bearing 5 is guided in its bottom both sides by L-shaped guides 9, 9. The chains 2, 2b of the second cable bearing 6 are formed narrower than the chain 2a, 2a width of the first cable bearing 5, so that the lower first cable bearing 5 forms the guide of the second cable bearing 6. Then, the two cable bearings 5, 6 are connected to an expansion boom 7.