Accession Number : ADD002397

Title :   Train Resonant Car-Body Rocking Detector System.

Descriptive Note : Patent,


Personal Author(s) : Swaim,Frank H

Report Date : 25 Nov 1975

Pagination or Media Count : 8

Abstract : The patent relates to a method whereby a hydraulic sensor detects and registers the resonant rocking motion of a train car and activates the brake system to stop the train prior to possible derailment due to wheel 'rock-off' from the track. A hydraulic input arm attached to the sideframe pressurizes fluid within the sensor mounted on the bolster. Pressure build-up within a specific time interval due to rock-off resonant oscillation causes a ram to extend from the sensor and crush a piezoelectric element. The resultant signal activates an electroexplosive brake line venting mechanism, puncturing and venting the brake line to decelerate the train and dissipate the resonant oscillation-mode energy to immediately stabilize the rock-off situation and then gradually reduce train speed to a stop.

Descriptors :   *Railroad cars, *Accidents, *Detectors, *Patents, Roll, Hydraulic servomechanisms, Braking

Subject Categories : Surface Transportation and Equipment
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE