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US Patent: 18,266
Improvement in Hand-Wrenches
Henry D. Blake - New Hartford, CT

USPTO Classifications:
81/126, 81/90.1

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

W. H. Warner - New Britain, CT

Not known to have been produced

S. E. Case
Julius B. Barnes

Patent Dates:
Granted: Sep. 22, 1857

Patent Pictures:
H. D. Blake Pat. Sept. 22, 1857
USPTO pdf tiff
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The adjustable jaws are arranged in a rough parallelogram. A thumb piece extends toward the handle on the inner jaw segment. Motion of the "T" shaped handle segment opens or closes the jaw opening. Both pipe and nut wrench applications are shown in the patent drawing.

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