Abstract: An air ventilator for a helmet that can enhance the assemblability and stability by improving the assembly structure of the air duct assembled to the top of the helmet, is disclosed. The air ventilator comprises an air duct 20, a guide rail 40, and a slider 50. The air duct 20 is assembled on the top surface of the helmet 1 so as to cover around a plurality of air ventilation holes 1a. The guide rail 40 has both sides bent upward widthwise and bent again in the direction of the edge of the width to form first flanges 41. The slider 50 has both sides bent upward widthwise and bent again in the direction of the center of the width to form second flanges 51 and slidably mount on the guide rail 40 in close contact with the bottom of the air duct 20.

Abstract: The present invention relates to a shield mounting device used when a shield adapted to protect a front side of a helmet user is assembled to a body of a helmet. A shield mounting device of a helmet comprises a base plate having a guide with a circular rim wall and fixed to a body of a helmet; a connection member forming in an inner surface of the shield and engaged to an inner surface of the guide; a locker assembled to an outer surface of the rim wall of the guide and locking and unlocking the connection member engaged to the guide; an insertion groove formed in an inner side of the rim wall of the guide; a protrusion piece formed on an outer surface of the rim wall; and an engaging piece formed in an outer surface of the connection member and inserted into the insertion groove.

Abstract: The present invention relates to an air mask for a helmet of a motorcycle which is selectively detachable by a user of a helmet for protecting a user's head when a user rides a motorcycle, snowmobile, bicycle, etc.