King Direct-Acting Pump Valve Gear, Patent Model

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This model was submitted to the U.S. Patent Office with the application for the patent issued to John C. King, of New York, New York, September 20, 1870, no. 107504.
The model represents a direct-connected steam pump provided with rotary oscillating valves on the steam and water cylinders operated by an arm on the piston rod and a swinging lever. The peculiar feature of the design is the use of a sharp-edged spring-actuated slide, which acts upon a roller on the swinging lever to rapidly change the valve position as the pistons near the end of their strokes. During the first part of the stroke the roller on the swinging lever acts upon one side of the slide and forces it up against a coil spring. Toward the end of the stroke the roller passes under the sharp edge of the slide and the force of the spring causes the slide to push the roller and swinging lever rapidly in the direction in which it is traveling.
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
King, John C.
place made
United States: New York
associated place
United States: New York, New York
Physical Description
wood (overall material)
wood steam pump-from catalog card: 10 in; 25.4 cm
overall: 8 1/4 in x 11 1/2 in x 3 1/2 in; 20.955 cm x 29.21 cm x 8.89 cm
ID Number
accession number
catalog number
patent number
See more items in
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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