Ladder construction
OwnerFrederick M. Pettitinventor
Life of this patent
Estimating the term…
Abstract
A ladder consisting of a pair of spaced rails, a plurality of rungs having opposite end portions with first holes extending therethrough for receiving the rails in complementary mating relationship, first slots extending inwardly into the rungs from the bottom sides thereof and terminating at bearing areas which bear on the outer ends of first pins which are carried by the rails, and a pivotal rung-like base having end portions with second holes extending inwardly from the top side thereof for receiving the ends of the rails and second slots extending inwardly into the rung-like base from the top side thereof terminating at bearing surfaces which carry the load transmitted by the outer ends of second pins mounted on the lower ends of the rails.
Claims13
A ladder comprising a pair of spaced rails, a plurality of spaced rungs each having a central portion and integral opposite end portions and upper and lower sides, holes extending through said end portions and through said upper and lower sides for receiving said rail, pins extending through said rails and having outer end portions extending beyond said rails, and slot means in said rungs extending outwardly from opposite sides of each of said holes and extending inwardly into said rungs from said lower sides on opposite sides of each of said holes and terminating at bearing areas within said rungs for receiving said outer end portions of said pins with said bearing areas bearing on said outer end portions of said pins.
A ladder comprising a pair of spaced rails having upper and lower ends, a plurality of rungs between said upper and lower ends, means mounting said rungs on said spaced rails, a rung-like base having a longitudinal axis and opposite end portions and upper and lower sides, holes in said opposite end portions, pins having longitudinal axes extending through said lower ends of said rails in the direction of said longitudinal axis and having outer end portions extending beyond said rails, slot means in said end portions of said rung-like base extending outwardly from opposite sides of each of said holes and extending inwardly into said rung-like base from said upper side thereof on opposite sides of each of said holes and terminating at bearing areas within said rung-like base for receiving said outer end portions of said pins with said pins bearing on said bearing areas.
Dependencies are inferred from the claim text.