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US Patent: 454,222
John A. Miller - St. Louis, MO

USPTO Classifications:
81/111, 81/179, 81/185.2

Tool Categories:
wrenches : wrench adjustment types : quick adjust wrenches
wrenches : wrench components : wrench jaw components


Not known to have been produced

C. F. Keller
E. E. Longan
C. K. Jones

Patent Dates:
Applied: Oct. 03, 1890
Granted: Jun. 16, 1891

Patent Pictures:
John A. Miller patent June 16, 1891
USPTO pdf tiff
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Caliper action jaws; the adjustment held by a set screw on a curved arm. One jaw opening has a fixed set of gripping teeth; the other jaw has a set of gripping teeth pushed into engagement by a spring. The curved arm is held in place by removable plates. The patent also details the form and operation of the removable plates and the set screw and binding plate.

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