Patent ID: 6119811
Filing Date: 2000-09-19
Classification: E06C

Abstract:
A foldable and portable ladder comprising a plurality of ladder units, whereineach ladder unit is comprised of two parallel supporting means, a step means provided between the supporting means, and control means provided on either side of the step means posterior to the supporting means,and wherein adjacent ladder units are pivotally connected by pivotal shafts and the control means comprising an upper block, a lower block symmetrical to the upper block, said upper and lower block forming between them a transversal round hole and a long hole, each block having a regulating groove located within and transverse to the round and long holes, a regulating ring is provided within the regulating groove, a buckling rod extending through the regulating ring, and a regulating spring, wherein the control means serves to buckle or unbuckle adjacent ladder units in order to render the ladder rigid or collapsible, respectively.