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US Patent: 644,033
Combined Spanner and Wrench
Combined Spanner and Sliding-Jaw Wrench
Frederick Schrader - Bridgeport, CT

USPTO Classifications:
81/176.3, 81/77

Tool Categories:
wrenches : bicycle or pocket wrenches


Frederick Schrader - Bridgeport, CT

H. A. Lamb
S. W. Atherton
A. M. Wooster

Patent Dates:
Applied: Dec. 04, 1899
Granted: Feb. 20, 1900

Patent Pictures: [ 1 | 2 | 3 ]
Frederick Schrader Pat. Feb. 20, 1900
USPTO pdf tiff
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The patent is an improvement on Schrader's May 11, 1897 adjustable spanner patent (no. 582,238). It adds an adjustable wrench with the second spanner "jaw" as a "tail" to the adjustable jaw. The wrench produced may be marked with both the 1897 and 1900 patent dates, or only May 11, 1897.

Another variant with a square stud or poll on the back angle of the fixed jaw includes a third patent date -- Oct. 18, 1898 -- corresponding to design patent no. D29,520.

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