Extensible ladder
AssigneeFoxdale Developments Limited
InventorRonald Barry Thomas Jones
Life of this patent
Estimating the term…
Abstract
An extensible ladder includes a plurality of sections, each having a pair of tubular uprights connected by a rung, with the uprights of each section being slidably engaged with the corresponding uprights of an adjacent section. The inside surface of the tubular uprights are provided with longitudinally extending grooves, which reduce the area of sliding contact between adjacent uprights, thereby making the ladder easier to extend or collapse.
Claims11
An extensible ladder comprising a plurality of sections, each section having a pair of tubular uprights which comprise substantially flat parallel side walls and convex front and rear walls, the side walls of the respective uprights of each section being connected by a rung, with the uprights of each section being telescopically engaged with the corresponding uprights of an adjacent section, the uprights being formed with longitudinally extending grooves which reduce the area of sliding contact between adjacent sections.
Dependencies are inferred from the claim text.