#$%^&*AU2016225881B220180621.pdf#####ABSTRACT The invention belongs to the technical field of helmets and relates to a helmet with a transformable jaw protecting structure, wherein a jaw protector is reliably transformed between a full-face helmet position and a half-face helmet position in a gear constraint structure and mode, and the uniqueness and reversibility of a kinematical and geometrical locus of the jaw protector can be kept everywhere during a round trip. The helmet according to the invention has the greatest advantages that: the integrity of a whole structure of the mount and the jaw protector can be kept while implementing a transformable jaw protecting structure of the helmet in the meanwhile, thus ensuring that these core members have higher intensity and rigidity, and effectively enhancing the use safety of the helmet; in addition, an exposed slit may be dramatically reduced or even completely eliminated, buzzing noises derived by flowing an air current through a helmet housing surface and rainwater invasion may be significantly reduced, and a wearing comfort of the helmet is effectively improved; and besides, the difficulty in assembling the mount and the jaw protector is reduced and a precise gear engagement and constraint structure is adopted, so that the quality reliability of a helmet product can be effectively improved.
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