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US Patent: 447,952
Truman D. Keith - South Pasadena, CA

USPTO Classifications:
81/186, 81/92

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches
wrenches : pipe wrenches


Keith Mfg. Co. - Aurora, IL
D. H. Smalley & Co. - Aurora, IL
Aurora Mfg. & Tool Co. - Aurora, IL

W. S. Duvall
H. G. Dieterich
G.  E. Prosser
T. Earley

Patent Dates:
Applied: Nov. 21, 1890
Granted: Mar. 10, 1891

Patent Pictures:
Truman D. Keith patent March 10, 1891 with example of Keith wrench.
USPTO pdf tiff
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The base of the movable jaw can be shifted on one of several holding notches in the main shank. A spring pushes the gripping jaw face toward the holding jaw face, making the wrench self-adjusting within the general size range selected.

Corresponding Canadian patent no. CA-36,549 was granted May 5, 1891 and corresponding British patent GB-189107938 was registered May 8, 1891.

Sept. 15, 1895 HEATING AND VENTILATION has a write-up in which the manufacturer is cited as Aurora Mfg. and Tool Co. of Aurora, IL.

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