Abstract: A roof rock spreader has a rock hopper and a motive drive system. An optical system detects areas already treated and areas still in need of treatment. Location aware sensors detect present location and speed of travel. A control system determines proper application paths and locations, and controls application of roof rock to provide an even and consistent layer. When the rock hopper empties, the roof rock spreader will move to a refill location. A laser alignment system detects and confirms proper hopper positioning prior to automated refill. During the refilling procedure, wheel load sensors monitor hopper fill. Rock hopper refill may be limited, to accommodate gross vehicle weight limitations of a particular roof. A communication system provides remote viewing through the optical system or other camera to confirm proper function, provides remote emergency shut-off, and enables a plurality of like spreaders to work in unison.

Abstract: A wheeled conveyance straddles and squeezes a parapet or similar vertical wall from both the inside and outside vertical faces. Side wheels may be adjusted to be closer together or farther apart to accommodate the thickness of the wall being straddled. The conveyance traverses the parapet along the top edge, and at least one fastener driver suspended from the carriage faces one or both of the inside and outside vertical faces at some preferably adjustable distance below the top edge of the parapet. While the conveyance traverses the parapet, an actuator selectively and repeatedly actuates the fastener driver(s). Various sensors and controls are provided that permit the speed, fastener spacing, and travel distance to be adjusted. Position awareness and visual, auditory, and radio communications may optionally be employed.

Abstract: A roof rock spreader has a rock hopper and a motive drive system. An optical system detects areas already treated and areas still in need of treatment. Location aware sensors detect present location and speed of travel. A control system determines proper application paths and locations, and controls application of roof rock to provide an even and consistent layer. When the rock hopper empties, the roof rock spreader will move to a refill location. A laser alignment system detects and confirms proper hopper positioning prior to automated refill. During the refilling procedure, wheel load sensors monitor hopper fill. Rock hopper refill may be limited, to accommodate gross vehicle weight limitations of a particular roof. A communication system provides remote viewing through the optical system or other camera to confirm proper function, provides remote emergency shut-off, and enables a plurality of like spreaders to work in unison.