| 摘要 |
A stabilizer constituting member or ventilation opening forming member 51 having a stabilizer portion or ventilation opening forming portion 61 , which has an air current deflection surface 63 gradually separating from an outer surface of a head protecting body in the range of the front end to the rear end of the stabilizer portion or ventilation opening forming portion 61 , is disposed on an outer side of the head protecting body. According to one aspect, exhaust openings 55 a to 55 c are formed in a step surface 64 extending from near the rear end of the air current deflection surface 63 substantially toward the outer surface of the head protecting body. According to another aspect, the ventilation opening forming member 51 further has air current divider portions 62 a and 62 b having exhaust openings 54 a and 54 b surrounded by substantially two-way forked projecting ridges 66 , respectively. Thus, air in the head protecting body can be effectively discharged from the exhaust openings 55 a to 55 c and/or 54 a and 54 b. According to the other aspect, the traveling stability of the head protecting body can be achieved. |
