rockshaft
/ˈrɑkˌʃæft/
noun
- A shaft or passage cut through rock, as in a mine or tunnel.
- A rockshaft collapsed in the old mine, blocking access to the lower levels.
- Miners descended into the dark rockshaft to reach the coal seam.
- The engineers designed a new ventilation system for the rockshaft.
- A mechanical rod or bar that rocks or oscillates, used in machinery.
- The rockshaft in the steam engine needed regular lubrication.
- He replaced the worn rockshaft in the printing press to fix the jam.
- The engine's rockshaft transfers motion from the cam to the valves.