PURPOSE: To prevent a holding fixture made of aluminum in the vicinity of an area brought into contact with each trolley line from being corroded, and thereby provide each trolley line the covering layer itself of which is also excellent in corrosion resistance by covering with a zinc layer each trolley line which is supported so as to be fixed by the holding fixture made of aluminum at its groove sections, and furthermore, covering with a chromate treated layer the aforesaid zinc layer.
CONSTITUTION: Each trolley line 1 includes a groove section 2 supported by a rigid body trolley line holding fixture 10 made of aluminum, forms a zinc layer 3 in its all surfaces, and also forms a chromate treated layer over the aforesaid zinc layer. Besides, the surface of the chromate treated layer 4 shall be uniform and of brass in color. Since the zinc layer is formed all over the surface of each trolley line 1, and the chromate treated layer is also formed over the aforesaid zinc layer, galvanic corrosion in the area and its vicinity of the holding fixture made of aluminum brought into contact with each trolley line 1 is prevented, and besides, the corrosion resistance of each trolley itself is thereby enhanced.
MAEKAWA NOBUYUKI
NAKAJIMA KATSUJI
KITAGAWA AKIRA
MIURA YOSHITAKA
YAMAGUCHI TOSHIO
PARKER KAKO KK