Collinson Manhole Cover for Boilers, Patent Model
date: label: date made
content: 1875
label: patent date
content: 1875-04-13
name: label: inventor
content: Collinson, Henry
notes: label: Description
content: This model was submitted to the U.S. Patent Office with the application for the patent issued to Henry Collinson, Boston, Massachusetts, April 13, 1875, no. 161934.
label: Description
content: The invention consists of a lid or cover with a true flat face arranged in such a manner that while being forced home against a flat seat it receives a sliding and rotating motion thereon.
label: Description
content: The model represents an opening in a plate around which is formed a flat plane face, which forms a seat for the dish –shaped lid or cover. A curved bar of metal spans the opening over the cover and supports a threaded nut through which passes a T-handled screw by which the cover is forced against the seat. At the inner end of the screw is an eccentric head that fits in a recess in the center of the cover, so that turning the screw forces the cover against the seat and moves the center of the cover in a circle, while the friction causes the cover to rotate somewhat about its own center. The result is a combined sliding and rotating of the cover as it is forced against the 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: Massachusetts
label: associated place
content: United States: Massachusetts, Boston
setName: label: See more items in
content: Work and Industry: Mechanical and Civil Engineering
label: See more items in
content: Bulletin 173
label: See more items in
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: ER.309219
label: accession number
content: 89797
label: catalog number
content: 309219
label: patent number
content: 161,934
objectType: label: Object Name
content: boiler, steam, manhole cover, model
label: Object Name
content: patent model, manhole cover
label: Object Type
content: Patent Model
physicalDescription: label: Physical Description
content: brass (overall material)
label: Measurements
content: overall: 4 1/4 in x 5 1/2 in x 4 3/8 in; 10.795 cm x 13.97 cm x 11.1125 cm