Warren Spring Motor, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to John Warren, of Detroit, Michigan, April 20, 1880, no. 226813.
The motor represented is of the class intended to operate light machinery such as a phonograph but differs from most of the class in that it employs a spiral spring instead of the usual coil spring. It converts the rectilinear motion of the spring into rotary motion and equalizes the varying tension of the spring.
The free end of the spring carries a nut that engages in a spiral-grooved motor shaft, which revolves at the axis of the spring. A hand crank, worm, and worm wheel are used to compress the spring by turning the shaft in the reverse direction. The power is taken from a bevel gear on the shaft. A ball nut, which employs a ball to follow in the groove of the shaft, is used because an ordinary nut would not work in the groove of varying pitch. The varying pitch is used to compensate for the varying tension of the spring.
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
Warren, John
associated place
United States: Michigan, Detroit
Physical Description
brass (overall material)
overall: 12 1/2 in x 4 7/8 in x 4 3/4 in; 31.75 cm x 12.3825 cm x 12.065 cm
ID Number
catalog number
accession 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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