Door system for a mine stopping

摘要

A door system for closing a doorway in a mine stopping includes a door hinged adjacent the doorway for swinging relative to the stopping between a closed position and an open position. A keeper is mounted in fixed position relative to the doorway. A latch mechanism is cooperable with the keeper for latching the door in its closed position. The latch mechanism has a detent portion and is operable to move the detent portion between a latching position in which the detent portion engages the keeper for latching the door closed, and an unlatching position in which the detent portion is disengaged from the keeper for allowing the door to be opened. The latch mechanism is constructed and configured so that it operates to move the detent portion along a path defined at least in part by an arc centered on a point spaced away from the door whereby the detent portion is adapted to remain in substantial engagement with the keeper to maintain the door closed in the event the keeper moves relative to the door, as in a mine convergence.