Collinson Manhole Cover for Boilers, Patent Model
Collinson Manhole Cover for Boilers, Patent Model
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- Description
- 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.
- 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.
- 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.
- Reference:
- 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.
- Location
- Currently not on view
- Object Name
- boiler, steam, manhole cover, model
- patent model, manhole cover
- Object Type
- Patent Model
- date made
- 1875
- patent date
- 1875-04-13
- inventor
- Collinson, Henry
- place made
- United States: Massachusetts
- associated place
- United States: Massachusetts, Boston
- Physical Description
- brass (overall material)
- Measurements
- 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
- ID Number
- ER.309219
- accession number
- 89797
- catalog number
- 309219
- patent number
- 161,934
- See more items in
- Work and Industry: Mechanical and Civil Engineering
- Bulletin 173
- Engineering, Building, and Architecture
- Work
- Industry & Manufacturing
- Data Source
- National Museum of American History
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