A two-position ladder platform designed for operation by a single climber so as to provide the climber with a broad foot support in its erected position and to retract to a recessed position to avoid impairing the climber. The device includes a platform section, preferably rectangular in shape, with...http://www.google.co.uk/patents/US4696373?utm_source=gb-gplus-sharePatent US4696373 - Two-position ladder platform
