Transport refrigeration door status sensing device

Details Transport refrigeration door status sensing device Transport refrigeration door status sensing device

2006-05-30

2008-11-25

Bugg, George A (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S686100, C116S012000

Reexamination Certificate

active

07456738

ABSTRACT:
A door status sensing device for a transport container including a door. The door status sensing device includes an emitter attached to the container that transmits a first wireless signal in a first direction toward the door. A reflector attaches to the door and is aligned with the emitter to receive the first wireless signal, and generates a second wireless signal in a second direction opposite the first direction in response to the first wireless signal. The sensing device further includes a receiver attached to the container adjacent the emitter and opposite the reflector. The receiver is substantially aligned with the reflector, receives the second wireless signal, and generates a third signal indicative of the condition of the door condition in response to receipt of the second wireless signal. A controller selectively generates an alarm in response to the third signal indicative of the condition of the door.

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patent: 2002/0196155 (2002-12-01), McNulty, Jr.
patent: 2004/0189460 (2004-09-01), Heaton et al.

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