Uhry and Luttgens Valve Gearing, Patent Model

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This model was submitted to the U.S. Patent Office with the application for the patent issued to H. Uhry and H. A. Luttgens, of Paterson, New Jersey, March 20, 1855, no. 12564.
The model represents a “link motion” applicable to marine, locomotive, or stationary steam engine. It is a combination of three eccentrics, the ordinary Stephenson link motion, an additional link pivoted to the Stephenson link, a differential rocker, and a main rocker. The main rocker and the Stephenson link operate one valve, which distributes steam to the cylinder, supplies outside lead, and cuts off the steam in proportion to the decrease of travel. The valve operated by the differential rocker exhausts the steam and opens and cuts off the admission of steam near full stroke of the piston.
This description comes from the 1939 Catalog of the Mechanical Collections of the Division of Engineering United States Museum Bulletin 173 by Frank A. Taylor.
Currently not on view
date made
patent date
Uhry, H.
place made
United States: New Jersey
associated place
United States: New Jersey, Paterson
overall: 5 3/4 in x 13 1/4 in x 3 1/2 in; 14.605 cm x 33.655 cm x 8.89 cm
cylinder and eccentrics - from catalog card: 10 in; 25.4 cm
ID Number
catalog number
accession number
patent number
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Work and Industry: Mechanical and Civil Engineering
Industry & Manufacturing
Bulletin 173
Engineering, Building, and Architecture
Data Source
National Museum of American History


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