Hot-box signalling devices

Details Hot-box signalling devices Hot-box signalling devices

B - Operations, Transporting

61

K

346/62

B61K 9/04 (2006.01)

Patent

CA 1126378

C A N A D A Title: IMPROVEMENTS RELATING TO HOT-BOX SIGNALLING DEVICES ABSTRACT OF THE DISCLOSURE Hot-box signalling devices are disclosed for indicat- ing the presence of overheated bearings in vehicles such as rail cars. The device includes means defining a closed compartment containing a fluid and pressure-sensitive means communicating with said compartment. The compartment is arranged in thermal communication with a bearing of the vehicle so that increases in the temperature of the bearing cause increases in the pressure exerted by the fluid. The pressure-sensitive means is adapted to produce a signal when the pressure exerted by the fluid exceeds a predetermined threshold representing an over-temperature condition in the bearing. Preferably, the pressure-sensitive means takes the form of a plug normally closing an opening in the com- partment, and a marker material, the plug and marker material being expelled when the pressure in the compart- ment reaches said predetermined threshold. In one aspect of the invention, provision is made to compensate for ambient temperature. The invention also provides a system for detecting a signal produced by a hot-box signalling device.

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