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US Patent: 463,137
Engineer's Wrench
Patentee:
Daniel H. Carpenter (exact or similar names) - Orlando, FL

USPTO Classifications:
81/125.1, 81/186

Tool Categories:
wrenches : wrench components : wrench jaw components

Assignees:
None

Manufacturer:
Daniel H. Carpenter - Orlando, FL

Witnesses:
J. D. Lowry
M. M. France
George Klinkhart
E. A. Fincner

Patent Dates:
Applied: Jul. 18, 1891
Granted: Nov. 17, 1891

Patent Pictures:
Daniel H. Carpenter patent November 17, 1891
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Description:
Ridgid jaw design parallel to the adjustable wrench concept patented in U.S. patent no. 446,324 and British patent no. GB-189102450. That idea was further refined in patent no. 515,070. The "notch" is also incorporated as an option in Carpenter's January 19, 1892 patent (no. 467,151). See also Canadian patent CA-38,340 granted Febr. 24, 1892.

The principle is gripping on flats adjacent to nut corners, so the corners are not rounded, and the wrench can be re-positioned without bodily removing the wrench. The Automatic Grip grip wrench was marketed in the early 20th Century.

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