Abstract: A positive pressure personal air filtration system particularly advantageous in the close quarters of a low ceiling mine. An air pump and air filter unit is mounted to a vest worn by a user and is connected to a nose and mouth mask by an air hose which, if the unit is mounted to the back of the vest, passes directly over the user's shoulder. The mask has upper and side edges contoured to seat against the user's face from immediately above the user's nose and extending down the user's cheeks. The mask extends further downward to a bottom termination edge which is contoured to extend in spaced relationship out in front of the user's face to define a non-valved opening to ambient air across the entire bottom of the mask. The termination edge extends downward to a lower level than the user's mouth and preferably to the level of the user's chin to form an air reservoir.

Abstract: A bat wing for a shuttle car includes a top plate, a lower plate and at least one shieve wheel positioned between the top plate and the lower plate for spacing the top plate a predetermined distance from the lower plate. The lower plate includes at least a first edge, second edge and third edge substantially contiguous to each other and forming the lower plate having a predetermined area. The first and second edges of the lower plate forming a lower edge spaced a predetermined distance from the at least one shieve wheel. The top plate includes at least a first edge, second edge and third edge substantially contiguous to each other and forming the top plate having a predetermined area being greater than the predetermined area of the lower plate. The first and second edges of the top plate forming a top edge spaced a predetermined distance from the at least one shieve wheel and extending outwardly therefrom a distance greater than the predetermined distance of the lower edge from the at least one shieve wheel.