| 摘要 |
PROBLEM TO BE SOLVED: To provide a full-face helmet convenient to use even under worn through such a design as to make its jaw part turnable about a pivot on both sides thereof relative to the main body so as to render the jaw part openable. SOLUTION: This full-face helmet is designed to make the jaw part 14 thereof surrounding both the jaw and mouth of a relevant wearer turnable about a pivot 13 on both sides of the helmet relative to the main body 12 so as to render the jaw part 14 openable as necessary; for this purpose, the following actions are taken: an inner side junction thinner than the main body 12 is formed in the front of the lower part of the body 12, an outer side junction thinner than the jaw part 14 being formed in the rear of the jaw part 14, and the inner junction and the outer junction are superposed on each other; wherein the outer side junction is turnably connected via the pivot 13 to the inner side junction, and furthermore, the contact surface between the inner side junction and the outer side junction are provided with both projections 12aa and grooves 14aa so as to be turnable for the jaw part 14 only when an external force is applied thereto and the contact surface is jointed snap-fashion.
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