The drapery rod support comprises a mounting plate which includes a central web and a pair of laterally spaced, vertically extending ribs projecting from the front side thereof, the web having a slot between the ribs extending parallel to the ribs. A pair of flange members are welded to the rear side...http://www.google.com.au/patents/US4179091?utm_source=gb-gplus-sharePatent US4179091 - Vertically adjustable drapery rod support
