TODAY’S PATENT – RETRACTABLE ROOF FOR STADIUM STRUCTURE
The RETRACTABLE ROOF FOR STADIUM STRUCTURE was invented by Brian Brisbin (Toronto), Felim McCaffrey (Toronto), Peter Sheffield (Toronto) on 26th February 1991, bearing the patent number US4995203A.
The present invention relates to structures having a roof which may be opened and closed. In particular, the invention relates to a roof which is made of rigid panels which nest together when opened and which partially overlap when closed.
A structure is provided having two opposing nested pairs of outwardly convex roof arches mounted for rotation about a generally horizontal axis. Each pair of nested roof arches can be rotated about its axis from a lowered nested condition to a raised condition where the inner portion of one arch partially overlaps the other arch of the nested pair. In a preferred arrangement the arches extend between supports on diametrically opposing sides of a stadium building, which has an upper opening. A double acting hydraulic cylinder arrangement is connected to the arches at a distance from their horizontal axes to move them between their raised and lowered positions.