Davies Steam Pump, Patent Model
date: label: date made
content: 1880
label: patent date
content: 1880-03-09
name: label: inventor
content: Davies, Joseph D.
notes: label: Description
content: This model was submitted to the U.S. Patent Office with the application for the patent issued to Joseph D. Davies, of Covington, Kentucky, March 9, 1880, no. 225351.
label: Description
content: The model represents a direct-acting steam pump, provided with two auxiliary oscillating cylinders, which offer a constantly decreasing resistance to the movement of the steam piston during the first half of its stroke and a constantly increasing assistance during the remaining half. The purpose of this is to equalize the effective force of the steam piston throughout its stroke when the steam is used expansively.
label: Description
content: The two auxiliary cylinders are mounted in trunnions, one on each side of the frame of the engine. The rods from the auxiliary pistons are attached to a clamp on the main piston rod, so located that the auxiliary cylinders are perpendicular to the main piston rod when the main piston is at midstroke. The auxiliary pistons, in the model, work against a spiral spring, which is compressed during the first half of the stroke and which expands during the last half. In effect the springs act as would a flywheel, storing the energy in excess of the resistance, while steam at high pressure acts upon the engine piston, and delivering the stored energy after the steam has been cut off and is expanding in the cylinder. The inventor described his device using a fluid, as steam or water under pressure within the auxiliary cylinders.
label: Description
content: Reference:
label: Description
content: 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.
label: Location
content: Currently not on view
place: label: place made
content: United States: Kentucky
label: associated place
content: United States: Kentucky, Covington
topic: label: Subject
content: Patent Models
label: Subject
content: Steam Engines
setName: label: See more items in
content: Work and Industry: Mechanical and Civil Engineering
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content: Bulletin 173
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content: Engineering, Building, and Architecture
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content: Work
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content: Industry & Manufacturing
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content: Patent Models
publisher: label: Related Publication
content: Frank A. Taylor. Catalog of the Mechanical Collections of the Division of Engineering United States National Museum, Bulletin 173
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MC.308711
label: catalog number
content: 308711
label: accession number
content: 89797
label: patent number
content: 225,351
objectType: label: Object Name
content: pump, steam, model
label: Object Name
content: patent model, engine, steam
label: Object Type
content: Patent Model
physicalDescription: label: Physical Description
content: brass (overall material)
label: Measurements
content: overall: 2 3/4 in x 5 5/8 in x 10 5/8 in; 6.985 cm x 14.2875 cm x 26.9875 cm