ALEXANDRIA, Va., May 12 -- United States Patent no. 12,624,594, issued on May 12, was assigned to Tricam Industries LLC (Eden Prairie, Minn.).
"Adjustable hinge for a multi-position ladder" was invented by Joseph P. Foley (St. Paul, Minn.), Dennis D. Simpson (Plymouth, Minn.) and Benjamin P. Williams (Chaska, Minn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An improved adjustable hinge for a multi-position ladder that is positionable in a variety of configurations while being ergonomic to adjust and which is structurally sound, rigid, and easy to adjust, light in weight, and has a long service life. The mating surfaces of the outer hinge plates, inner hinge plates, and inner hinge center spacer are large...