Stevens Rocking Grate Bar, Patent Model

Stevens Rocking Grate Bar, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to Francis B. Stevens, November 11, 1879, no. 221430.
The model represents a grate surface formed of ordinary fish-bellied grate bars on each of the lower ends of which two journal bearings are formed to fit into and rest in two corresponding rounded socket bearings. The bar is made to rock in each of these bearings alternately to the right and left, so that the upper part of the grate overhangs the right-hand socket when rocked to the right, and the left-hand socket when rocked to the left. That the upper part of the grate bar will overhang the center on which it turns is the improvement claimed by the inventor.
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
furnace grate, model
patent model, furnace grate
Object Type
Patent Model
date made
patent date
Stevens, Francis B.
place made
United States: New Jersey, Hoboken
associated place
United States: New Jersey, Hoboken
Physical Description
cast iron (overall material)
overall - from catalog card: 6 1/2 in x 10 1/2 in x 1 7/8 in; 16.51 cm x 26.67 cm x 4.7625 cm
overall: 4 in x 6 3/4 in x 11 in; 10.16 cm x 17.145 cm x 27.94 cm
ID Number
catalog number
accession number
patent number
See more items in
Work and Industry: Mechanical and Civil Engineering
Industry & Manufacturing
Bulletin 173
Engineering, Building, and Architecture
Data Source
National Museum of American History
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