Tubular access ladder and method
View Patent ↗An access ladder includes a plurality of sections connected together to telescope between an extended position and a retracted position that has an increasing reactive force to counterbalance the weight of the sections as they extend. A method for accessing a room with a ladder connected to a ceiling including the steps of moving the ladder to a fully extended position subject to an increasingly active force to counterbalance the weight of the ladder as it extends. There is the step of retracting the ladder into a retracted position in the ceiling.
1. A method for accessing a room with a ladder connected to a ceiling, the ladder having a plurality of sections having a first and second sides respectively, wherein each said section is telescopically connected together and each said section respectively has a rung with a respective tube attached to each end of said rung so that the respective tubes of each said section are positioned on said first and second sides, the respective tubes align to form a channel on the first side and the second side so that each said side has an extension spring disposed within and along an entire length of each channel, the method provides a plurality of steps including:
moving the ladder from a retracted position to a fully extended position so that as the ladder extends below the ceiling an increasingly active force is produced by the two extension springs to counterbalance a weight of the ladder; and
retracting the ladder into the retracted position in the room above the ceiling;
wherein the step of moving the ladder from the retracted to the fully extended position includes a step of pulling down a lowest section of the ladder sections until plunger assemblies in a section directly above the lowest section find corresponding holes in tubes of the lowest section causing the plunger assemblies to extend into the corresponding holes.
2. A method as described in claim 1 wherein the retracting step includes a step of forcing sections of the ladder below an uppermost section of the ladder up to the uppermost section so cam portions on tube bottoms of the uppermost section will cam plunger assemblies of a section below the uppermost section into their fully retracted positions.