Patent ID: 7207128

Claim:
Display apparatus comprising at least one pair of elongate holding devices extending along opposite sides of an imaginary rectangle, the holding devices having respective longitudinal recesses which hold respective edge portions of a poster, at least one holding device of the pair comprising a fixed bearing member and a movable member which contains the recess and which is pivotable about a pivot axis relative to the fixed bearing member from (a) an active position, in which the recess is open in a direction away from the opposite holding device so that the poster turns back on itself near the edge portion, the poster being under tension between the pair of holding devices, to (b) a passive position, in which tension in the poster is released sufficiently to allow the edge portion to be removed from the recess of the said one holding device; in which the fixed bearing member has a fixed end portion, an intermediate portion, and a free end portion, the intermediate portion has a convex bearing surface, part of which is partially cylindrical, the free end portion has a cylindrical external bearing surface coaxial with the partially cylindrical part of the convex bearing surface of the intermediate portion but of smaller diameter, the movable member has first and second longitudinal wings which define between them an open cavity to receive the free end portion and intermediate portion of the fixed bearing member, the first wing has in the cavity a concave partially cylindrical bearing surface which matches the cylindrical external bearing surface of the free end portion, the first wing is received in a space between the free end portion and the intermediate portion of the fixed bearing member when the movable member is in its passive position, and the second wing has in the cavity a concave surface which fits against the convex bearing surface of the intermediate portion when the movable member is in its active position.