Hewitt Piston-Rod Packing, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to John Hewitt, of St. Louis, Missouri, June 3, 1879, no. 216038.
The model represents a 2-piece, flange-and-gland stuffing box of the usual form, packed with malleable metal rings with beveled edges. The rings are alternately beveled in opposite directions so that adjoining surfaces match. The edges of the flange and gland are beveled so that when the parts are brought together and tightened the effect is of a number of double wedges sliding together and expanding between the stuffing box and the shaft.
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
Object Name
piston rod packing, model
patent model, piston rod packing
date made
patent date
Hewitt, John
Physical Description
brass (overall material)
overall: 3 in x 4 in x 7 in; 7.62 cm x 10.16 cm x 17.78 cm
place made
United States: Missouri
associated place
United States: Missouri, St. Louis
ID Number
catalog number
accession number
patent number
Engineering, Building, and Architecture
Industry & Manufacturing
Bulletin 173
See more items in
Work and Industry: Mechanical and Civil Engineering
Bulletin 173
Data Source
National Museum of American History, Kenneth E. Behring Center
Related Publication
Frank A. Taylor. Catalog of the Mechanical Collections of the Division of Engineering United States National Museum, Bulletin 173
Additional Media

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