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US Patent: 593,157
Ratchet mechanism
Patentee:
Zachry T. Furbish - Philadelphia, PA

USPTO Classifications:
192/43.1, 192/51, 193/44, 74/127, 74/14, 74/16, 74/571M, 74/577R, 74/86, 81/62, 81/63.1

Tool Categories:
screwdrivers : screwdriver mechanisms : spiral screwdrivers

Assignees:
North Brothers Manufacturing Co. - Philadelphia, PA

Manufacturer:
North Brothers Manufacturing Co. - Philadelphia, PA

Witnesses:
Unknown

Patent Dates:
Applied: Aug. 03, 1897
Granted: Nov. 02, 1897

Patent Pictures: [ 1 | 2 | 3 | 4 | 5 ]
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Description:
Information taken from Clifford D. Fales' database at http://www.idcomm.com/personal/cfales/intro.htm

The second of many Furbish patents assigned to North Brothers. This patent covers multiple features (ratchet screwdriver, spiral screwdriver, spiral screwdriver/drill, continuous rotary motion from double reciprocating motion, spiral screwdriver with ratchet screwdriver.

Marked, "YANKEE / NORTH BROS. MFG. CO. / Philadelphia, PA. U.S.A. / PATENTED / NOV. 2, 1897"

This is the ratchet patent used on many early North Brothers archimedean drill and drivers, such as Models 30, 50, 40, and 41.

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