Allen Cut-Off Valve, Patent Model
date: label: date made
content: 1842
label: patent date
content: 1842-04-30
name: label: inventor
content: Allen, Horatio
notes: label: Description
content: This model was submitted to the U.S. Patent Office with the application for the patent issued to Horatio Allen, of New York, New York, April 30, 1842, no. 2597.
label: Description
content: This model represents a valve gear in which separate steam chests are employed for the head-end and crank-end main steam valves. The supply of steam to each of these steam chests is controlled by additional cut-off valves, the movement of which is adjustable. The inventor refers to this invention as an improvement in the valve gear patented by him August 21, 1841 (patent number 2227).
label: Description
content: The model shows a portion of the cylinder of a horizontal engine with only the piston rod and cross head represented. A steam chest in which are located the ports leading to the inner or main steam chests is shown in section, revealing the cut-off valves on their seats. These cut-off valves are plain flat plates connected to opposite ends of a beam, which receives a vibratory motion from the cross head of the engine. The beam and its rock shaft are picoted in a lever by which the pivot can be moved and the time of cut-of varied. This the inventor calls “cut-off with movable rock shaft.” He suggests that a similar result can be obtained by constructing the cut-off ports in a movable plate which he calls “cut-off with single adjustable seat.”
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: New York
label: associated place
content: United States: New York, New York City
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
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.308640
label: catalog number
content: 308640
label: accession number
content: 89797
label: patent number
content: 2,597
objectType: label: Object Name
content: patent model, valve, steam engine cut off
label: Object Type
content: Patent Model
physicalDescription: label: Physical Description
content: wood, metal (overall material)
label: Measurements
content: on green board-from catalog card: 21 in x 11 in; 53.34 cm x 27.94 cm
label: Measurements
content: overall: 1 3/8 in x 20 7/8 in x 10 7/8 in; 3.4925 cm x 53.0225 cm x 27.6225 cm