US Patent 8079616 Seatbelt apparatus

A seatbelt apparatus is provided which can constrain a passenger by ensuring removal of a slack of a lap belt when two pretensioners are activated under two different time frames. A pretensioner of a seatbelt retractor is activated first, and a shoulder belt and a lap belt are pulled in a direction toward the seatbelt retractor. Subsequently, a pretensioner of a belt anchor portion is activated and pulls a seatbelt toward the belt anchor portion, and hence a one-way tongue catches and locks the seatbelt. Accordingly, the shoulder belt is prevented from moving toward the lap belt through the tongue. Therefore, removal of the slack of the lap belt is ensured, and hence a lumber of the passenger is firmly fixed.