Patent ID: 7086445

Claim:
Apparatus comprising: an elongate opening having two rails each arranged along a respective side of the opening, a fabric sheet having a length to cover at least a part of the length of the opening and a width between two side edges to span the width between the rails; each side edge of the sheet having therealong a respective support member arranged for engaging the respective rail so as to attach the side edge to the rail; a carriage movable along the opening; and a reel mounted on the carriage and arranged to roll the sheet and the two support members onto the reel and to un-roll the sheet and the two support members therefrom; such that the sheet member can be unrolled from the reel by movement of the carriage longitudinally along the opening in one direction for deployment over the opening and can be rolled onto the reel by movement of the carriage longitudinally along the opening in an opposed direction for exposing the opening; wherein the sheet is wider than the rails; wherein the carriage has guides for deploying the sheet; and wherein the guides are arranged to direct the support members from a wider position maintaining the sheet flat on the reel inwardly to the width of the rails as the sheet is deployed.