Passive seat belt system
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- Patent
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A passive seat belt system for controllably restraining a passenger in an automotive vehicle in response to the opening and closing states of a vehicle door. The passive seat belt system is comprised of a seat belt which selectively takes a passenger releasing position at which the passenger is released from restraint and a passenger restraining position at which the passenger is restrained. A door switch is provided to output first and second signals when a vehicle door is in opening and closing states, respectively. A control circuit is electrically connected to the door switch and arranged to output a third signal in response to the first signal. A driving device is electrically connected to the control circuit and arranged to drive the seat belt in the direction of the passenger releasing position when being supplied with the third signal from the control circuit. Additionally, an interrupting circuit is electrically connected between a line connecting the door switch and the control circuit and another line connecting the control circuit and the driving device. The interrupting circuit is arranged to prevent the third signal from being supplied from the control circuit to the driving device when the first signal is output from the door switch, thereby preventing the seat belt from being driven to the passenger releasing position even under malfunction of the control circuit to output the third signal.