Hydraulic walking mine support frame setting mechanism - has manometer connecting following setting lead between prop and pressure load

摘要

A pressure duct is connectable to a prop or props via a main control appliance governed by an advance control for setting a hydraulic walking support frame in position in an underground mine. Parallel to the main control between the pressure lead and prop, is an after-setting lead connected to the pressure lead via a piston manometer. The regulating piston acting on this may be controlled from the prop. This enables full setting to be attained in the support frame.