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US Patent: 582,238
Adjustable Spanner
Adjustable Spanner-Wrench
Frederick Schrader - Bridgeport, CT

USPTO Classifications:
81/176.1, 81/437, D8/22

Tool Categories:
wrenches : wrench combination tools
wrenches : bicycle or pocket wrenches


Not known to have been produced

Jno. E. Parker
J. Henderson
W. W. Caswell
F. H. Spencer

Patent Dates:
Applied: Feb. 18, 1897
Granted: May 11, 1897

Patent Pictures:
Frederick Schrader Pat. May 11, 1897
USPTO pdf tiff
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The tool combines screwdriver, open end wrench, and adjustable hook spanner. It is intended for use with circular lock-nuts such as those used on bicycle crank bearings. The hook spanner adjusts by a thumbscrew. The adjustable spanner wrench marked with this patent date actually corresponds to Schrader's Feb. 20, 1900 patent (no. 644,033).

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