Cage door status indication

Details Cage door status indication Cage door status indication

B - Operations, Transporting

66

B

325/1

B66B 13/14 (2006.01) B66B 19/06 (2006.01)

Patent

CA 1221419

ABSTRACT In a multi-deck underground cage each door has a switch fitted to it to provide a door-open or door-closed signal. The signals identify the respective door and are used to modulate an infrared carrier signal which is transmitted downwardly and reflected to a receiver. Information decoded from the carrier signal is displayed to indicate the status of each door at a location remote from the cage.

429370

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