Safety wheel, method of manufacturing such a wheel and bogie equipped with such a wheel
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United States of America Patent
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Jan 20, 2004
Grant Date -
Apr 24, 2003
app pub date -
Nov 19, 1999
filing date -
Nov 19, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a safety wheel, for a subway coach bogie, or the like, running on pneumatic tires, adapted to be interposed between a chassis of the bogie and a corresponding tire, said wheel presenting an outer peripheral zone having a braking portion as well as a guiding portion projecting radially outwardly from the braking portion, the hardness of the braking portion being much greater than the hardness of the guiding portion. This may be achieved for example by effecting a selective tempering of the braking portion by peripheral nozzles projecting a cooling liquid. This safety wheel is considerably longer lasting than those of the prior art.
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