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List of North Bros. Patents applying to
Yankee drills & screwdrivers
by
George Langford
Revised February 24, 2007

Click on the bold patent numbers to see text and drawings of patents using Google Patents.
You can use the DATAMP website to find many if not all of the patents issued to the inventors: Fegley, Furbish & Leopold.
Underlined/linked patent descriptions are on this site.
The patent numbers in italics are linked to the US Patent Office; those in bold are linked to Google Patents.
Inventor(s) Description of invention   Date granted  Patent No.
Zachry T. Furbish Ratchet mechanism used in the Yankee 2100 and 2101 braces and in Yankee screwdrivers.   Nov. 2, 1897   593,157
George O. Leopold Ratchet mechanism used in the 3- and 5-speed Yankee drills that have double (reversible) gearing, No's 555, 1555, 1550, 550, 1540, 540, 1545, 545, and 1530.  July 28, 1908   894,673
Thomas J. Fegley Detachable-blade mechanism used in the Yankee No. 65 & 66 screwdrivers.  Oct. 27, 1908   902,387
Zachry T. Furbish Locking mechanism used in Yankee spiral push drills & screwdrivers which holds the blade in a retracted position.   Nov. 3, 1908   902,957
George O. Leopold Speed-change gear mechanism used in the two-speed, reversible Yankee drills, No's 1555, 555, 1545, and 545.  Dec. 15, 1908   906,902
George O. Leopold Speed-change gear mechanism not used in any production Yankee drill ...   Apr. 6, 1909   917,319
George O. Leopold Ratchet,  reverse, and speed-change mechanisms exactly as used in the two-speed Yankees drills, No's 1555, 555, 1545, and 545.   Nov. 2, 1909   939,042
George O. Leopold Ball bearing used in the front thrust & radial bearing of the larger Yankee drills, No's 1555, 555, 1550, 550, 1545, 545, 1540, 540, 1455, 455, 1445, and 455.  Aug. 23, 1910   968,372
George O. Leopold Ratchet & reverse mechanism used in the Yankee 1530 drill.  Jan. 24, 1911   982,510
T.J.Fegley & G.O.Leopold Means of attaching blades of tools to handles.  Oct. 15, 1912  1,041,451