Patent ID: 6425820
Filing Date: 2002-07-30
Classification: E21F

Abstract:
A power operated mine door system forming an airlock space in a mine with at least one door of the mine door system being on a fresh air side of the mine door system, said mine door system comprising:a plurality of doors mounted in a mine passage in spaced apart relation, each door including at least one leaf mounted for moving between open and closed positions, said doors forming an airlock with the airlock space therebetween, at least one door being a return air side door and at least one door being a fresh air side door; a single source of pressurized fluid, said source including only one non-explosion proof motor and only one fluid pump driven by the motor, said motor being positioned in the mine passage on the fresh air side of the fresh air side door; a plurality of actuators each operably connected to at least one leaf and to the single source of pressurized fluid to selectively apply driving force to at least one leaf and thereby move at least one leaf to at least one of said open and closed positions; and a control system operably connected to the actuators for selectively allowing pressurized fluid to flow to each said actuator for applying said driving force to a selected at least one leaf for moving it to at least one of its open and closed positions.