Data recorder suitable for use as a railcar hunting detector

Details Data recorder suitable for use as a railcar hunting detector Data recorder suitable for use as a railcar hunting detector

2007-01-09

2007-01-09

Nguyen, Hung (Department: 2612)

Communications: electrical

Land vehicle alarms or indicators

Of collision or contact with external object

C340S438000, C340S679000, C340S686100, C340S691500, C340S933000

Reexamination Certificate

active

10933838

ABSTRACT:
A data recorder for use as a hunting detector includes a piezofilm accelerometer. A bandpass filter tuned to the approximate frequency of a hunting railcar couples the output of the accelerometer to a hold circuit. A controller, operating primarily in a low power consumption “sleep” mode, awakens periodically to check the hold circuit. If the contents of the hold circuit is greater than a predetermined value, a counter is incremented. When the counter exceeds a preset limit, then a flasher on the exterior of the data recorder is enabled.

REFERENCES:
patent: 4179744 (1979-12-01), Lowe
patent: 5578877 (1996-11-01), Tiemann
patent: 5579013 (1996-11-01), Hershey et al.
patent: 5622338 (1997-04-01), Klink
patent: 5855004 (1998-12-01), Novosel et al.
patent: 5924654 (1999-07-01), Anderson
patent: 6371417 (2002-04-01), Southon
patent: 7034711 (2006-04-01), Sakatani et al.
patent: 2002/0196135 (2002-12-01), Slifkin et al.

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