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US Patent: 9,030X
Improvement in screw wrench
Solyman Merrick - Springfield, MA

USPTO Classifications:

Tool Categories:
wrenches : nut wrenches


Bemis & Call - Springfield, MA

William Bliss
Charles A. Mann

Patent Dates:
Granted: Aug. 17, 1835

Reissue Information:
Reissued as RX-38 (May 17, 1842)

Patent Pictures:
Solyman Merrick patent August 17, 1835, Reissue May 1842 and August, 1849. Renewed 1851 . 12 inch example
USPTO pdf tiff
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The internally threaded adjusting nut engages thread cut on the shank of the wrench. The adjusting nut attaches to the moveable jaw with a strap. This is the first U.S. Screw adjust wrench patent. Reissued 17 May 1842; Extended 7 years from 17 August 1849 ; Renewed 2nd time 25 November 1851.

An 1836 JOURNAL OF THE FRANKLIN INSTITUTE summary of this patent notes "manufactured by N. FOOT of Springfield, Massachusetts." (Probably HOMER FOOT & Co.)

Wrenches based on this patent and subsequent modifications were produced into the mid-20th Century.

Loring Coes' April 16, 1841 patent no. 2,054 includes reference to Merrick's wrench by way of contrast.

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