Abstract: An apparatus, for brushing particulate material and the like from a surface, has a rotating brush, for example a cylindrical brush driven by hydraulic motor. The brush can be applied lightly to a surface and rotated relatively slowly, so as to brush material from the surface and project it forwardly. A strong air jet is provided in front of the brush and across the front of it, so as to pick up and entrain debris, snow, etc. brushed from the surface and blow or carry it laterally to one side. To dislodge material adhering to the bristles of the brush and prevent this from being carried behind it, a secondary, stripper nozzle is provided across the front of the brush for removing such material and causing it to drop in front of the brush. The apparatus enables the complete cleaning of a surface, for example an airport runway, in a single pass, and enables low brush pressure and speed to be provided, giving increased brush life.

Abstract: A spray apparatus has first and second elongate ducts. The material to be sprayed, which may be solid or liquid, is delivered through the first elongate duct to an elongate slot-shaped nozzle or other means for distributing it. To reduce disturbance by de-energizing ambient air currents, the second elongate duct supplies air to first and second air distribution outlets, each of which defines an elongate slot-shaped nozzle. The nozzle is directed outwardly, away from the air distribution mechanism and towards the surface on which the material is to be distributed, so as to form air curtains on either side of the elongate ducts. The elongate air distribution outlet can form an elongate slot-shaped nozzle having a convergent inlet section, a throat section and a diffuser section extending to an outlet port. It can also include fins extending into the air duct, to deflect air from the air duct through the slot-shape nozzle.

Abstract: A spray apparatus has first and second elongate ducts. The material to be sprayed, which may be solid or liquid, is delivered through the first elongate duct to an elongate slot-shaped nozzle or other means for distributing it. To reduce disturbance by de-energizing ambient air currents, the second elongate duct supplies air to first and second air distribution outlets, each of which defines an elongate slot-shaped nozzle. The nozzle is directed outwardly, away from the air distribution mechanism and towards the surface on which the material is to be distributed, so as to form air curtains on either side of the elongate ducts. The elongate air distribution outlet can form an elongate slot-shaped nozzle having a convergent inlet section, a throat section and a diffuser section extending to an outlet port. It can also include fins extending into the air duct, to deflect air from the air duct through the slot-shape nozzle.