Abstract: A device for opening-closing sun visor of a helmet is disclosed. The device comprises a helmet body 10 provided in front with an opening portion 11 for the face and having a pair of hinge shafts 12 protruded on both the left and right sides, a sun visor 20 having a visor portion 21 placed on the side of the opening portion 11 of the helmet body 10, extending portions 22 extended to the left and right sides of the visor portion 21, and hinge slots 23 formed at the ends of the extending portions 22; and an opening-closing mechanism 30 having a slider 31 connected to the top center of the visor portion 21 of the sun visor 20, a guide rail 32 which is attached to the ceiling of the helmet body 10, and a guide holder 35 which is attached lengthwise to the top center of the helmet body.

Abstract: A device for opening-closing jaw guard of a helmet is disclosed. The device has a hinge means 400 comprising fixed plates 410 which are fixed on both the left and right sides of the helmet body 1 and each of which has a long hole 411, operating plates 420 which are fixed on the inside of the left and right extending portions 4a of the jaw guard 4 and each of which has an arc-shaped internal gear 421, a planetary gear 430 which is engaged with the internal gear 421 of the operating plate 420, and has a protuberance 431 formed on either side, and a cutaway portion 432 formed on the outer circumference; and a pivoting lever 440 which has a shaft protuberance 441 of front end inserted into the cutaway portion 432 of the planetary gear 430 and a penetration hole 442 of rear end inserted into the main boss 423 of the operating plate 420.