Raised floor having multiple layers

Claim 1

A raised floor having multiple layers to be installed on the subfloor of a room for providing an air-conditioning conduit for cool air and a conduit for computer network wiring, said raised floor comprising a multiplicity of base seats, lower layer plates, upper layer plates, center cover plates and edge cover plates, wherein the base seat has a base plate on which a plurality of projected stud holes are provided for mounting a plurality of studs each of which is capped with a stud cap; the lower layer plate has a plurality of stud holes to engage with the studs so as to allow four lower layer plates to be seated on one base plate, leaving a first air gap between the lower layer plates and the subfloor to be used as an air-conditioning conduit, the upper layer plate has a plurality of through holes each of which is fitted with one stud cap so as to allow four upper layer plates to be seated on one base seat, leaving a second air gap between the lower layer plates and upper layer plates; the upper layer plate has a smaller size than the lower plate, leaving a third gap between adjacent upper layer plates when the upper layer plates are seated on the base seats; each upper layer plate has four edge recesses so as to allow each edge cover plate to properly cover the third gap between two adjacent upper layer plates; the upper layer plate has a plurality of corner recesses so as to allow each center cover plate to properly cover the gap defined by the corners of four upper layer plates seating on a base seat; said raised floor further comprising vents and bellows for inducing the cool air from the first air gap into the room.