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US Patent: 557,311
Henry J. Martin - Chicago, IL

USPTO Classifications:
76/114, 81/176

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

Whitman & Barnes Manufacturing Co. - Akron, OH

Not known to have been produced

Wm. J. Henning
Charles L. Hine
Albert H. Bates

Patent Dates:
Applied: Dec. 20, 1895
Granted: Mar. 31, 1896

Patent Pictures:
Henry J. Martin patent March 31, 1896
USPTO pdf tiff
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Worm and rack adjustable pocket wrench with the worm engaging teeth cut in opposite sides of a slot running up the mid-line of the handle.

The specifications detail how the parts are assembled in the movable jaw of this design.

Cited as a reference in patent no. 2,444,135.

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