Here is an interesting page of photos and drawings about the working of the Wynn-Williams ground lever boxes. Each time the lever is pulled it toggles the points to the opposite side, and then springs back:
https://www.valleysignals.org.nz/track/springpoints.html
The original USA patent PDF is on the above Get file download button.
This is the drawing from the USA patent (click twice to see full size scan):
Supplier's catalogue drawings (click twice to see larger scans):
Martin.
https://www.valleysignals.org.nz/track/springpoints.html
The original USA patent PDF is on the above Get file download button.
This is the drawing from the USA patent (click twice to see full size scan):
Supplier's catalogue drawings (click twice to see larger scans):
Martin.