poppet head

noun

the framework above a mining shaft that supports the winding mechanism

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for poppet head

Historical Examples of poppet head

The tailstock or poppet-head screw is a right hand because the nut moves in this case.
Modern Machine-Shop Practice, Volumes I and II
Joshua Rose