Ford to put air bags into back seat belts

DETROIT (AP) -- Air bags have long been mounted in the steering wheel, dashboard and sides of vehicles. Now, they're in the seat belts.

Ford Motor Co. plans to introduce seat belt-mounted air bags in the back seat of the 2011 Ford Explorer sport utility vehicle, which will hit the market next fall. Ford says it's the first automaker to mass produce the technology.

The belts have a cylindrical air bag that stretches from the buckle to the shoulder and fits inside a pocket sewn into the belt. If the air bag is needed, the car sends a signal that releases the bag. It inflates more gently than a front air bag, and with cooler air, so it's safer for children.

Srini Sundararajan, the Ford engineer who was chiefly responsible for developing the seat belts, says the wider belts and bags help distribute crash forces across the occupant's chest, so there's less chance of a serious injury. They also help support the occupant's head and neck.

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