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.