US Patent: 825,401


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US Patent: 825,401

Wrench

Patentee:

John Merckens (exact or similar names) - Chicago, IL

USPTO Classifications:

7/138, 81/120, 81/177.1, 81/186

Tool Categories:

wrenches : alligator wrenches

combination tools

wrenches : wrench combination tools

Assignees:

Edmonds Metzel Mfg. Co. - Chicago, IL

Manufacturer:

Edmonds Metzel Mfg. Co. - Chicago, IL

Witnesses:

Patent Dates:
Applied:	Dec. 05, 1904
Granted:	Jul. 10, 1906

Patent Pictures: [ 1 | 2 ]

John Merckens patent July 10, 1906

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Description:

The patent is for the laminated construction whereby the gripping parts of tempered steel are reinforced by tougher less brittle material. The thread cutters are a separate patent -- No. 828,859 (the drawings are nearly identical!!). The resulting tool with laminated construction is marked "PERPETUAL GRIP ALL PARTS RENEWABLE."

See also patent no. 816,570 for another Edmonds-Metzel alligator wrench design.