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US Patent: 5,707
Screw-Wrench
Improved screw wrench
Patentee:
Solyman Merrick - Springfield, MA

USPTO Classifications:
81/174

Tool Categories:
wrenches : nut wrenches
wrenches : pipe and nut combination wrenches

Assignees:
None

Manufacturer:
H. Foot - Springfield, MA

Witnesses:
Henry Fox
Homer Foot

Patent Dates:
Applied: Mar. 29, 1848
Granted: Aug. 15, 1848

Patent Pictures: [ 1 | 2 ]
Solyman Merrick patent Aug. 14, 1848
USPTO pdf tiff
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Description:
According to the specifications, this second Merrick screw wrench patent has extensions of the moveable jaw fixed into a groove in the adjusting nut, the jaws close at a slight angle and the surface of one jaw was roughened so the wrench would grip pipe as well as flat sided objects.

Known example marked, "H. Foot & Co. Merrick's Pat." has the connection between the adjusting nut and movable jaw, but the jaws are parallel and do not appear to have pipe gripping serrations.

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