Fuel tank cap and method of manufacturing the same

摘要

The structure of the present invention enables static electricity to be discharged quickly and stably when the user manually touches a fuel tank cap 10 to open or close the cap 10. The fuel tank cap 10 has a casing body 20 and a cover member 40 with four discharge projections 46 for discharging static electricity to a filler neck FN of a fuel tank. The four discharge projections 46 are arranged in a third radial direction D3-D4 that has an angle of 45 degrees with respect to both a first radial direction D1 and a second radial direction D2. The first radial direction D1, in which a handle member 42 of the cover member 40 is arranged, gives the maximum contraction of the cover member 40, whereas the second radial direction D2 gives the minimum contraction of the cover member 40. Namely the four discharge projections 46 are arranged on a circle about the center of the cover member 40 to reduce the effect of resin contraction.