Patent ID: 7456738
Filing Date: 2008-11-25
Classification: B65D,G06Q,G08B

Abstract:
1. A door status sensing device for a transport container including a first door, a second door, and a transport refrigeration system having climate control apparatus, the sensing device comprising: an emitter attached to the container and configured to transmit a first wireless signal in a first direction toward the first door; a reflector coupled to the first door and substantially aligned with the emitter, the reflector configured to sense the first wireless signal and to generate a second wireless signal in a second direction substantially opposite the first direction in response to the first wireless signal; a receiver attached to the container adjacent the emitter and opposite the reflector, the receiver substantially aligned with the reflector and configured to sense the second wireless signal and to generate a third signal indicative of the first door condition in response to receipt of the second wireless signal; a switch coupled to the second door and configured to generate a fourth signal indicative of a second door condition; and a controller in electrical communication with the receiver and the switch, the controller configured to selectively generate a first alarm in response to the third signal indicative of the first door condition and to selectively generate a second alarm in response to the fourth signal indicative of the second door condition.