US Patent 7962995 Apparatus for cleaning synthetic grass

An apparatus for cleaning a synthetic grass surface, the apparatus comprising a plenum head and a manifold, the plenum head disposed within the manifold and having a compressed air inlet and at least one air outlet through which air can be expelled against the synthetic grass surface for dislodgement of coarse and fine particulate material and to entrain the dislodged particulate material into the manifold which extends above the plenum head, said manifold including an outlet located in an upper region of the manifold for expelling the fine particulate material, and an outlet in a lower region of the manifold for distributing the coarse particulate material back to the synthetic grass surface, wherein the plenum head is mounted for rotation within the manifold about a substantially vertical axis.