Abstract: A disc brake assembly for a vehicle comprising an annular disc and a flange adapter for coupling the disc to the wheel of the vehicle for rotation with the wheel around the axle and for supporting the disc for axial movement. Two housing members are located on opposite sides of the disc and connected together and to the axle. A stationary brake shoe with a lining is located between one housing member and the disc and a further brake shoe with a lining is located between the disc and the other housing member and supported for axial movement. A camming arrangement is actuated by a pneumatic system for actuating the disc brake assembly for braking purposes. Removable shims are provided for spacing the two housing members apart and which may be removed for adjustment purposes as the brake lining wears.

Abstract: Air contaminated with combustible dust particles is removed and subjected to a high density air scrubber which safely removes the fine combustible dust particles from the contaminated air. The resulting water saturated, cleansed air is mixed with a continuously regulated amount of drier outside air until a desired absolute humidity is achieved, the regulation being responsive to the relative humidity changes within a work area in which the humidity is to be controlled. The air mixture is then conveyed into the work area which imparts a known temperature rise thereto. The temperature rise lowers the relative humidity of the air mixture to the desired level.