viagra pop over to this website Suiter Swantz IP takes a look back at past inventions and inventors with our Patent Of The Day.
On this day in 1903, Leamon G. Souder was granted U.S. Patent No. 723,325 for a MOVING SPIRAL STAIRWAY OR ELEVATOR.
This invention has relation to a moving stairway or elevator, and In such connection it relates more particularly to an improvement upon that type of stairway or elevator illustrated and described in Letters Patent No. 625,905, granted to Souder under date of May 30, 1899, the improvement residing in so constructing and arranging the parts of the stairway that the steps may ascend or descend in a spiral, thus forming a moving spiral stairway or elevator.
The principal objects of my present invention are, first, to provide a spiral stairway or elevator wherein the treads and risers constituting the steps of the stairway are flexed at right angles to each other when the steps ascend and descend, and the steps when so flexed travel in a spiral path either in ascending or descending, or both, and said treads and risers flexing into the same plane while changing from an ascending to a descending flight, or vice versa, and, second, to provide in conjunction with such a moving spiral stairway or elevator a landing-block at each floor traveled by the stairway, said block being of peculiar construction and arrangement so that the passenger may readily enter or leave-the steps of the stairway while the stairway is in motion.
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