It is a modified form of the English trestle frame. The Englischer Bock is a construction of supports for vertical load transfer and struts in the direction of the hoisting machine to absorb the horizontal forces. A characteristic element of the Tomson trestle are the pulleys mounted in the raised support pillars .
The Tomson-Bock was used in particular in the Ruhr mining industry, in its heyday there were over 100 of these headframes. The Tomson Bock was particularly widespread in the mines of the Harpen Mining AG , especially on coal mine Prussia , Scharnhorst colliery , coal mine New Iserlohn , Zeche Heinrich Gustav , Mine Kurl , mine Schürbank & Charlottenburg .
The only surviving Tomson goat is today on the site of the former Gneisenau colliery . At the same time, it is probably the oldest preserved headframe in the region.
- Hans Bansen The headframes . In: Hans Bansen, Karl Teiwes (Hrsg.): Die Schachtförderung (= The mining machines . A collection of manuals for company officials , edited by Hans Bansen, Volume 4). Published by Julius Springer, Berlin 1913, pp. 294-324.