Patent ID: 7748498
Filing Date: 2010-07-06
Classification: E04F,E06C

Abstract:
1. An access ladder for accessing a ceiling from a floor comprising: a plurality of sections which telescope open and closed, and from a bottom section each section telescopes open to positively lock to the section below it with plungers that lock and unlock each section in sequence as the sections open and close, respectively; and a header assembly attached to the ceiling, a top section of the plurality of sections pivotally connected to the header assembly, wherein each section comprises a step, a first rail and a second rail extending from the step, and a first plunger and a second plunger extending from the step to the first rail and the second rail, respectively, which engage with the first rail and the second rail, respectively, of the section below it to lock with the section below it; each section includes a first plunger cam and a second plunger cam attached to the underside of the step, each plunger cam extends below the step and engages with the first plunger and the second plunger, respectively, of the section below it to lock the section below it closed.