Helmet having a withdrawable shield

A helmet structure comprising an outer shell, a shield which is movable between a portion of use in front of the eyes of the wearer of the helmet and a withdrawn position and has a lower notch adapted to rest on the nose of the wearer, a support for the shield and comprising a bow member which is mounted in two diametrically opposed lateral portions of the bow member on the outer shell to pivot relative to the shell substantially forwardly and downwardly to bring the shield to said position of use and substantially rearwardly and upwardly to bring the shield to said withdrawn position, and which has an intermediate portion intermediate said lateral portions, elastically yieldable connecting means connecting the shield to said intermediate portion of the bow member and being operative to bias the shield relative to the bow member toward a center region of the inside of the shell throughout the movement of the shield between said withdrawn position and said position of use, the shield being free to be moved by the biasing action of the elastically yieldable connecting means in said position of use, and guide means carried by the shell in positions for engaging and guiding the shield in laterally outer regions of the shield and for displacing the shield relative to the bow member and deforming the yieldable connecting means in a direction opposed to the biasing action thereof when the shield has been shifted substantially away from said position of use in front of the eyes of the wearer of the helmet structure and moves toward said withdrawn position.