US Patent 8444178 Airbag apparatus

An airbag apparatus is provided with at least one detent assembly each including a micro switch, a telescopic cylinder slidably disposed in the micro switch, a bifurcation for fastening the cylinder by attaching to the micro switch, a first rope secured to the micro switch, and a second rope secured to the bifurcation wherein the micro switch is open in an inoperative position; an airbag; a cover spaced around the airbag; sensors disposed in an automobile; and an ECU for controlling the airbag and the sensors. The airbag is surrounded and fastened by the first and second ropes of the detent assemblies. The airbag expands to close the micro switch and break loose when an actual accident event is sensed by at least one of the sensors.