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US Patent: 438,343
Pipe Wrench
Patentee:
George H. Buzzell - Boston, MA

USPTO Classifications:
81/112

Tool Categories:
wrenches : alligator wrenches

Assignees:
George H. Buzzell - Boston, MA
Ozro C. Clarke - Boston, MA

Manufacturer:
George H. Buzzell - Boston, MA

Witnesses:
N. Turner
O.M. Shaw
M. Lamson

Patent Dates:
Applied: Aug. 18, 1890
Granted: Oct. 14, 1890

Patent Pictures: [ 1 | 2 ]
George H. Buzzell patent October 14, 1890. Photo of example courtesy Martin J. Donnelly www.mjdtools.com
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Description:
The jaws are hinged at the back, and the frame has a wedge divider between the jaws to spread them as they slide further out.

Corresponding Canadian patent no. CA-36,254 was granted April 1, 1891.

The example pictured is from a Martin J. Donnelly auction; wood and steel handled specimens are known. Manufacturer attribution from Ken Cope's "American Wrench Makers 1830-1930."

An unmarked "T" handle basin wrench combines the adjustment means from this patent with the jaw form from Buzzell's Oct. 10, 1876 basin wrench patent (no. 183,901).

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