Patent ID: 6931670

Claim:
A turning opening or closing member supporting structure of a helmet, wherein there is provided an operating mechanism for the turning opening or closing member over a helmet and the turning opening or closing member; said operating mechanism has a plurality of arc parts for use in controlling a turning action of the turning opening or closing member at any one of either the helmet or the turning opening or closing member; said arc parts are constituted such that a plurality of more than two arcs having each of different centers of arcs are cooperatively arranged in an integral manner, at least one of the arcs has a center of arc outside the operating mechanism, each of the arc centers including the arc center is coaxial with a center of turning of the turning opening or closing member during its opening or closing operation, and the turning opening or closing member is turned along an orbit of each of the arcs; and thereby the turning opening or closing member is turned along the orbit of each of said arcs while said center of turning is being switched during its opening or closing operation.