Underfriction

From Wikipedia, the free encyclopedia

You have new messages (last change).
A roller coaster wheel assembly. The underfriction wheels are on the bottom. The three sets of wheels clamp onto the track.
A roller coaster wheel assembly. The underfriction wheels are on the bottom. The three sets of wheels clamp onto the track.

On a roller coaster train, the underfriction, up-lift, or up-stop wheels are a device to keep the train from jumping off the track under intense movement. The design was patented in 1919 by John Miller.[1]

[edit] References

  1. ^ US1319888 (1919-10-28) John Miller Pleasure railway structure 
 This technology-related article is a stub. You can help Wikipedia by expanding it.
Retrieved from "http://en.wikipedia.org../../../u/n/d/Underfriction.html"