Abstract: A helmet with a gear-constraint type transformable chin guard structure may include a shell body, a chin guard and two branches on the chin guard, wherein a supporting base, the branch, an inner gear, an outer gear and a drive member form an associated mechanism, the inner gear and the outer gear are rotatable about fixed axes and constitute a meshing constraint pair, the inner gear and the branch are in sliding fit with each other and constitute a sliding constraint pair, and the drive member transfer the motion of the outer gear to the branch and causes the chin guard to make an extension/retraction displacement relative to the shell body, such that the chin guard makes an turnover motion while also recombining a reciprocating motion, thereby realizing a transformation between a full-helmet position and a semi-helmet position.

Abstract: A helmet shield opening mechanism is provided, wherein first and second constraint tracks are provided on at least one support leg of a shield jaw guard, and a driver element is configured to come into contact with and drive the two tracks, so that the helmet has forced and controlled modes relative to the opening action and process of the helmet body. On one hand, the operational reliability and flexibility of the shield opening mechanism can be improved; on the other hand, the shield is opened smoothly without collision, thus improving the wearing comfort of the helmet. Further, a helmet with changeable jaw guard equipped with the helmet shield opening mechanism can plan the opening process of the shield flexibly to adapt to states of the jaw guard at different operation positions, thereby greatly reducing the chances of collision between the jaw guard and the shield.

Abstract: A helmet with a gear-constraint type transformable chin guard structure may include a shell body, a chin guard and two branches on the chin guard, wherein a supporting base, the branch, an inner gear, an outer gear and a drive member form an associated mechanism, the inner gear and the outer gear are rotatable about fixed axes and constitute a meshing constraint pair, the inner gear and the branch are in sliding fit with each other and constitute a sliding constraint pair, and the drive member transfer the motion of the outer gear to the branch and causes the chin guard to make an extension/retraction displacement relative to the shell body, such that the chin guard makes an turnover motion while also recombining a reciprocating motion, thereby realizing a transformation between a full-helmet position and a semi-helmet position.

Abstract: A helmet shield opening mechanism is provided, wherein first and second constraint tracks are provided on at least one support leg of a shield jaw guard, and a driver element is configured to come into contact with and drive the two tracks, so that the helmet has forced and controlled modes relative to the opening action and process of the helmet body. On one hand, the operational reliability and flexibility of the shield opening mechanism can be improved; on the other hand, the shield is opened smoothly without collision, thus improving the wearing comfort of the helmet. Further, a helmet with changeable jaw guard equipped with the helmet shield opening mechanism can plan the opening process of the shield flexibly to adapt to states of the jaw guard at different operation positions, thereby greatly reducing the chances of collision between the jaw guard and the shield.

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.

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.