Patent ID: 6216818
Filing Date: 2001-04-17
Classification: E06C

Abstract:
A ladder which can be selectively actuated by a user between a default fully-immobile mode and an actuated fully-mobile mode, said ladder comprising:opposed first and second ladder frames jointly defining a wheel base having four feet which are normally in contact with the ground surface, four castors which can be selectively and simultaneously urged downwardly beyond the four feet so that the four feet are raised clear of the ground surface, wherein discontinuation of the selective downward urging of the four castors automatically causes the four feet to re-engage the ground surface under the effect of gravity such that the ladder reverts to its default fully-immobile mode,wherein a fixed height platform extends between the opposed first and second ladder frames, said fixed height platform being sized to accommodate a standing person, wherein the second ladder frame extends upwardly beyond the height of the fixed height platform, and wherein a readily movable goods lift is mounted relative to the second ladder frame for movement between an upper position located above the fixed height platform and adjacent the top of the second frame whereat a person standing on the fixed height platform can readily access the goods lift and a lower position below the fixed height platform whereat a person standing on the ground surface can readily access the goods lift, and wherein the ladder further comprises driving means for driving the goods lift between the upper position and lower position, said driving means being located so as to be operable by a person standing on the fixed height platform wherein the wheelbase of the ladder is extended beyond the second frame to improve the stability of the ladder.