Dirt removing grid system for floors

Abstract

A floor grid is provided for a trafficway for removing debris from traffic passing thereover. The grid comprises a support structure below the surface of the trafficway, a plurality of spaced tread rails defining an upper surface which is generally flush with the surface of the trafficway and being supported by the support structure, and a plurality of traverse spacer bars or channels positioned immediately beneath the tread rails. Each tread rail is secured to each spacer channel by a bolt where both cross. Each bolt has a head which is received in and is slidable, when the bolt is not tightened, along a pair of confronting slots in an associated tread rail. Each of the slots has a flat vertical surface which respectively butt against a pair of flat vertical surfaces of the bolt head preventing rotation of the bolt relative to the tread rail. Preferably the slots are just high enough to snugly receive the bolt heads. Feet extend outwardly from the lower end of each tread rail and engage the spacer channels. The feet in conjunction with the tightened bolts resist movement of the tread rail with respect to the spacer channels. The tread rails and spacer channels together form an insert which is easily removable for repair or cleaning. Cushions are provided between the tread rails and support structure to absorb vibration and impact.